2012 No. 11
Abstract：
Based on the requirements of the sustainable development and environment protection,the paper stated the necessity of the backfill mining in mine.With the collection and analysis on the application of 20 typical backfill mining faces in China,the paper systematically stated the technical features and suitable conditions of the mine roadway heading with the rejects backill,conventional longwall mining with the rejects bakililfully mechanized longwall coal mining with rejects backlill,high water material backfill and others.The solid rejects backfill of mine roadway heading is suitale for minor output and important protected buildings places.The longwall ful ly mechanized mining with solid rejects and paste backfill is saitable for the meohanized coal mining and conventional mining under the protected buildings places. The high water backill materia is suitable for the mine with shortage of backfill material and a single seam.The coal production,backfill value ,coal recovery rate,cost per ton of coal,backfill rate,convergence value, subsidence value, subsidence reduction rate, deformation value and protected area were provide as the evaluation indexes of the backfill mining effect.Finally,a fruther study should be conducted on high efficient backfill mining,backfill space sealing and others.
Based on the requirements of the sustainable development and environment protection,the paper stated the necessity of the backfill mining in mine.With the collection and analysis on the application of 20 typical backfill mining faces in China,the paper systematically stated the technical features and suitable conditions of the mine roadway heading with the rejects backill,conventional longwall mining with the rejects bakililfully mechanized longwall coal mining with rejects backlill,high water material backfill and others.The solid rejects backfill of mine roadway heading is suitale for minor output and important protected buildings places.The longwall ful ly mechanized mining with solid rejects and paste backfill is saitable for the meohanized coal mining and conventional mining under the protected buildings places. The high water backill materia is suitable for the mine with shortage of backfill material and a single seam.The coal production,backfill value ,coal recovery rate,cost per ton of coal,backfill rate,convergence value, subsidence value, subsidence reduction rate, deformation value and protected area were provide as the evaluation indexes of the backfill mining effect.Finally,a fruther study should be conducted on high efficient backfill mining,backfill space sealing and others.
Abstract：
Based on the property of the ultra high water material,the features of the backill mining technology with the ultra high water material was studied.The te chnology was including the open type,full package type,mixed type and other mining goaf backfill method.The backfill technical system was composed with material stor age and transportation,slurry preparation,slurry transportation,slurry mixing,and the backfill technical system was applied to several mines.The application results show ed that the ultra high water material had a high water content(water volume reached at 95%97%),fast setting rate(initial setting time of 890 min),high early strength,cons olidate incompressible,good loading performances,controllable material strength and setting time and other excellent performances and could be a good backfill material of the mining goaf.The backill technical system would have a low initial investment(not over RMB 5.0 millions),simple operation,high automatic degree and low pipelin e abrasive wear.After the backfill mining conducted,the backfill rate of the mining goaf was over 85% in average,the mine strata pressure behavior degree of the coal mi ning face was obviously reduced,the failure grade of the surface buildings was within grade I failure scope stipulated by the state.
Based on the property of the ultra high water material,the features of the backill mining technology with the ultra high water material was studied.The te chnology was including the open type,full package type,mixed type and other mining goaf backfill method.The backfill technical system was composed with material stor age and transportation,slurry preparation,slurry transportation,slurry mixing,and the backfill technical system was applied to several mines.The application results show ed that the ultra high water material had a high water content(water volume reached at 95%97%),fast setting rate(initial setting time of 890 min),high early strength,cons olidate incompressible,good loading performances,controllable material strength and setting time and other excellent performances and could be a good backfill material of the mining goaf.The backill technical system would have a low initial investment(not over RMB 5.0 millions),simple operation,high automatic degree and low pipelin e abrasive wear.After the backfill mining conducted,the backfill rate of the mining goaf was over 85% in average,the mine strata pressure behavior degree of the coal mi ning face was obviously reduced,the failure grade of the surface buildings was within grade I failure scope stipulated by the state.
Abstract：
In order to promote the application of the fully mechanized solids backfill integrated coal mining technology,to release the seam under the surface buildin gs,railway line and water body,to improve the coal mining rate of the mine and to realize the green mining in a mine,based on the brief introduction on the backfill minin g history and the target,requirements and difficulties to develop the modernized backfill mining technology,the paper systematically stated the system layout and key eq uipment of the fully mechanized solids backfill and coal mining integrated technology and introduced the project cases of the large scale backfill coal mining under the d ense building groups,in adjacent to the loose aquifer region and under the large river embankments. The application results showed that the fully mechanized solids bac kill integrated coal mining technology realized the safety and high efficient mining in seams under the surface buildings,railway line and water body and excellent social prospect would have a wide application prospect.
In order to promote the application of the fully mechanized solids backfill integrated coal mining technology,to release the seam under the surface buildin gs,railway line and water body,to improve the coal mining rate of the mine and to realize the green mining in a mine,based on the brief introduction on the backfill minin g history and the target,requirements and difficulties to develop the modernized backfill mining technology,the paper systematically stated the system layout and key eq uipment of the fully mechanized solids backfill and coal mining integrated technology and introduced the project cases of the large scale backfill coal mining under the d ense building groups,in adjacent to the loose aquifer region and under the large river embankments. The application results showed that the fully mechanized solids bac kill integrated coal mining technology realized the safety and high efficient mining in seams under the surface buildings,railway line and water body and excellent social prospect would have a wide application prospect.
Abstract：
Coal rejects, fly ash and other solid material transported from surface ground to the underground mine would be a base to implement the fully mechanize d solids backfill mining technology.To realize a high efficient and continued transportation of the solids backfill material, a solid material transportation technology with a material feeding well sunk from the surface ground to the underground mine was applied.A vertical feeding well structure including the feeding pipeline, the maintenanc e chamber and the material storage bunker was designed.A rational diameter for the pipeline was studied and obtained.Based on the impact problem occurred during th e solids feeding, cone buffer was designed.Meanwhile, in order to ensure the normal operation of the coal mining face and the safety of the personnel and environment, a study was conducted on the dust contral of the vertical feeding, discharging of high pressure air flow, jamming prevention bunker of the vertical feeding, cleaning of th e material storage bunker and other safety protection technology.The vertical transportation system of the solids material was successfully applied in Wugou Mine.
Coal rejects, fly ash and other solid material transported from surface ground to the underground mine would be a base to implement the fully mechanize d solids backfill mining technology.To realize a high efficient and continued transportation of the solids backfill material, a solid material transportation technology with a material feeding well sunk from the surface ground to the underground mine was applied.A vertical feeding well structure including the feeding pipeline, the maintenanc e chamber and the material storage bunker was designed.A rational diameter for the pipeline was studied and obtained.Based on the impact problem occurred during th e solids feeding, cone buffer was designed.Meanwhile, in order to ensure the normal operation of the coal mining face and the safety of the personnel and environment, a study was conducted on the dust contral of the vertical feeding, discharging of high pressure air flow, jamming prevention bunker of the vertical feeding, cleaning of th e material storage bunker and other safety protection technology.The vertical transportation system of the solids material was successfully applied in Wugou Mine.
Abstract：
Based on the summarization of Germany and Poland backfill mining,in view of coal mine building protection level and surface deformation index and oth er industry standard in China,Germany and Poland,the paper puts forward some suggestions about ground building deformation contral index when backfill mining.This paper indicates that should take into account geological and mining conditions, surface movement rule. surface protected objects0 movement allowed deformation index and the flling ability in the process of the backfill mining under buildings, and design optimum calculation model of the allowed mining thickness,workface flling rate and the workface mining speed and an assessment model on reducing damage to buildings benefits of backfill mining;in addition,for the sake of ensuring the safety mining u nder buildings,avoiding excessive flling and waste flling material which increase production cost,the related research results provide the optimal design reference for b ackfill mining under buildings.
Based on the summarization of Germany and Poland backfill mining,in view of coal mine building protection level and surface deformation index and oth er industry standard in China,Germany and Poland,the paper puts forward some suggestions about ground building deformation contral index when backfill mining.This paper indicates that should take into account geological and mining conditions, surface movement rule. surface protected objects0 movement allowed deformation index and the flling ability in the process of the backfill mining under buildings, and design optimum calculation model of the allowed mining thickness,workface flling rate and the workface mining speed and an assessment model on reducing damage to buildings benefits of backfill mining;in addition,for the sake of ensuring the safety mining u nder buildings,avoiding excessive flling and waste flling material which increase production cost,the related research results provide the optimal design reference for b ackfill mining under buildings.
Abstract：
Based on the summarization of Germany and Poland backfill mining,in view of coal mine building protection level and surface deformation index and oth er industry standard in China, Germany and Poland,the paper puts forward some suggestions about ground building deformation control index when backfill mining.This paper indicates that should take into account geological and mining conditions ,surface movement rule, surface protected objects口movement allowed deformation index and the flling ability in the process of the backfill mining under buildings,and design optimum calculation model of the allowed mining thickness,workface flling rate and the workface mining speed and an assessment model on reducing damage to buildings benefits of backfill mining;in addition,for the sake of ensuring the safety mining u nder buildings,avoiding excessive flling and waste flling material which increase production cost,the related research results provide the optimal design reference for b ackfill mining under buildings.
Based on the summarization of Germany and Poland backfill mining,in view of coal mine building protection level and surface deformation index and oth er industry standard in China, Germany and Poland,the paper puts forward some suggestions about ground building deformation control index when backfill mining.This paper indicates that should take into account geological and mining conditions ,surface movement rule, surface protected objects口movement allowed deformation index and the flling ability in the process of the backfill mining under buildings,and design optimum calculation model of the allowed mining thickness,workface flling rate and the workface mining speed and an assessment model on reducing damage to buildings benefits of backfill mining;in addition,for the sake of ensuring the safety mining u nder buildings,avoiding excessive flling and waste flling material which increase production cost,the related research results provide the optimal design reference for b ackfill mining under buildings.
Abstract：
In order to improve the drilling completed speed during the heading of the air returning roadway in the west No.4 mining block of North Mine ventilation s haft in Liliangdian Mine, a theoretical analysis, mineral composition measurement and site drilling test methods were applied to the study on the rapid borehole drilling C ompleted.The results showed that the sum of quartz and sodium feldspars was taken over 60% of the total amount of minerals in the rock, the rock hardness was mediu m and the wear of the drilling bits was high.When a bull bit was applied, the borehole drilling speed would fast and the borehole completed quality would be good.Durin g the drilling operation of the 2.5 m depth blasting borehole, the 2.5 m long drilling rod could be selected for the drilling operation.When the drilling depth reached at ab out 2.3 m, the 3.0 m long drilling rod shall be applied to the continued dilling and a fast borehole drilling could be realized.The completed time of a single borehole drilli ng could be reduced from 14 min to 8 min and thus the borehole completed speed could be improved.
In order to improve the drilling completed speed during the heading of the air returning roadway in the west No.4 mining block of North Mine ventilation s haft in Liliangdian Mine, a theoretical analysis, mineral composition measurement and site drilling test methods were applied to the study on the rapid borehole drilling C ompleted.The results showed that the sum of quartz and sodium feldspars was taken over 60% of the total amount of minerals in the rock, the rock hardness was mediu m and the wear of the drilling bits was high.When a bull bit was applied, the borehole drilling speed would fast and the borehole completed quality would be good.Durin g the drilling operation of the 2.5 m depth blasting borehole, the 2.5 m long drilling rod could be selected for the drilling operation.When the drilling depth reached at ab out 2.3 m, the 3.0 m long drilling rod shall be applied to the continued dilling and a fast borehole drilling could be realized.The completed time of a single borehole drilli ng could be reduced from 14 min to 8 min and thus the borehole completed speed could be improved.
Abstract：
In order to study the surface ground movement deformation law above the high cutting long coal mining face, the numerical simulation, theoretical analys is and site measuring method were applied to analyze the length variation of the high cutting long coal mining face affected to the surface ground movement deformatio n law.The critical conditions of the stability lost occurred when the pressure balanced arch of the overburden strata in the coal mining face reached a limit status and th e parameters of the surface ground movement deformation features were obtained.The study results showed that with the length of the coal mining face expanded, in th e inclined direction of the coal mining face, the separated bedding in the overburden strata would cause the height scope of the falling zone, surface ground movement deformation value and mining influence scope steadily increased.The max subsidence value and the max horizontal moving value of the surface ground would be in a li ner relationship to the mining length of the coal mining face.
In order to study the surface ground movement deformation law above the high cutting long coal mining face, the numerical simulation, theoretical analys is and site measuring method were applied to analyze the length variation of the high cutting long coal mining face affected to the surface ground movement deformatio n law.The critical conditions of the stability lost occurred when the pressure balanced arch of the overburden strata in the coal mining face reached a limit status and th e parameters of the surface ground movement deformation features were obtained.The study results showed that with the length of the coal mining face expanded, in th e inclined direction of the coal mining face, the separated bedding in the overburden strata would cause the height scope of the falling zone, surface ground movement deformation value and mining influence scope steadily increased.The max subsidence value and the max horizontal moving value of the surface ground would be in a li ner relationship to the mining length of the coal mining face.
Abstract：
According to thegateway driving easy to reveal the goaf problem before the reproduction of the integrated mine,based on the theoretical analysis numeri cal simulation and mine strata pressure observation and based on the high falling zone met during the gateway driving and the different conditions of the empty gatewa y,the bolt,anchor/steel mesh and stone brick lined H type steel shield support multi layers combined support technical means were applied to the reinforced support of t he surrounding rock in and along the driving gateway in the goaf,to solve the surrounding rock control technology with poor overburden strata strength in the goaf and p oor self loading structure.The practices showed that the reinforced support technology could effectively ensure the surrounding rock stability of the gateway,the converg ence of the two sidewalls was 118141 mm and the roof and floor convergence was 123 33 mm.
According to thegateway driving easy to reveal the goaf problem before the reproduction of the integrated mine,based on the theoretical analysis numeri cal simulation and mine strata pressure observation and based on the high falling zone met during the gateway driving and the different conditions of the empty gatewa y,the bolt,anchor/steel mesh and stone brick lined H type steel shield support multi layers combined support technical means were applied to the reinforced support of t he surrounding rock in and along the driving gateway in the goaf,to solve the surrounding rock control technology with poor overburden strata strength in the goaf and p oor self loading structure.The practices showed that the reinforced support technology could effectively ensure the surrounding rock stability of the gateway,the converg ence of the two sidewalls was 118141 mm and the roof and floor convergence was 123 33 mm.
Abstract：
In order to solve the support difficulties of the gateway retained along goaf with no gateway sidewall backill,with the theoretical analysis on the surround ing rock structure of the gateway and the support principle of the gateway retained along goaf,the single prop was replaced to the dense timber supports and the crossi ng articulated beam support method were applied to the design study of the support parameters.Thus coal rejects flowed into the gateway would naturally form coal reje ct stacks at the gateway sidewalls to support the roof of the gateway and the construction technique was simplified.The site measuring method was applied to the analy sis study on the support effect.The practice results showed that the support means effect was obvious,the max deformation value of the roof and floor in the gateway ret ained along goaf could be controlled within 800 mm,the max deformation value of the two sidewalls could be controlled within 600 mm,and the support effect was excel ent.
In order to solve the support difficulties of the gateway retained along goaf with no gateway sidewall backill,with the theoretical analysis on the surround ing rock structure of the gateway and the support principle of the gateway retained along goaf,the single prop was replaced to the dense timber supports and the crossi ng articulated beam support method were applied to the design study of the support parameters.Thus coal rejects flowed into the gateway would naturally form coal reje ct stacks at the gateway sidewalls to support the roof of the gateway and the construction technique was simplified.The site measuring method was applied to the analy sis study on the support effect.The practice results showed that the support means effect was obvious,the max deformation value of the roof and floor in the gateway ret ained along goaf could be controlled within 800 mm,the max deformation value of the two sidewalls could be controlled within 600 mm,and the support effect was excel ent.
Abstract：
According to the surrounding rock difficult contral problem of the used gateway when the coal pillar mining face was passing through the used gateway, a mechanics model of the main roof in the used gateway was established for the coal pillar mining face.When the width of the used gateway was increased, the support resistance required for the used gateway would be increased and there was a liner relationship between the support resistance of the used gateway and the thickness 0 f the main roof.The higher thickness of the main roof, the support resistance required by the used gateway would be higher.When the support resistance of the support was increased, the support resistance of the used gateway would be in liner reduced tendency.Based on the whole used gateway of the coal mining face divided into thr ee concentrated zones of the used gateway, the support technology of the mining gateway and the surrounding rock stable control technology when the coal mining fac e was passing through 4 used gateways in No.3 used gateway zone were studied.The top coal caving control when the coal mining face passing through the used gate way, advance reinforced support of the two gateways, roof control of the coal mining face and other safety protection measures were set up to ensure the safety mining operation of the coal pillar mining face.
According to the surrounding rock difficult contral problem of the used gateway when the coal pillar mining face was passing through the used gateway, a mechanics model of the main roof in the used gateway was established for the coal pillar mining face.When the width of the used gateway was increased, the support resistance required for the used gateway would be increased and there was a liner relationship between the support resistance of the used gateway and the thickness 0 f the main roof.The higher thickness of the main roof, the support resistance required by the used gateway would be higher.When the support resistance of the support was increased, the support resistance of the used gateway would be in liner reduced tendency.Based on the whole used gateway of the coal mining face divided into thr ee concentrated zones of the used gateway, the support technology of the mining gateway and the surrounding rock stable control technology when the coal mining fac e was passing through 4 used gateways in No.3 used gateway zone were studied.The top coal caving control when the coal mining face passing through the used gate way, advance reinforced support of the two gateways, roof control of the coal mining face and other safety protection measures were set up to ensure the safety mining operation of the coal pillar mining face.
Abstract：
In order to select a hydraulic powered support suitable for mining conditions of the coal mining face in No.15 seam of Jincheng Mining Area and to realiz e the mine high production and high efficiency, based on the application experiences of the ZZ6000/17/32 mode hydraulic powered support applied in No.15 seam minin g of Wangtaipu Mine and the mine strata pressure observation information, the powered support stressed conditions in No.2306 coal mining face of the mine were studi ed when the immediate roof initially fell down, the main roof initially pressurized, the main roof pressurized periodically and pressurized non-periodically.A study and an alysis on the insufficient rated working resistances of the support in the coal mining face and the problems existed in the powered support were conducted.The results s howed that the ZY 10000/16/32D mode two legs shield powered support selected for the coal mining face would have good suitability to the mining conditions of No.15 s eam in the mining area.
In order to select a hydraulic powered support suitable for mining conditions of the coal mining face in No.15 seam of Jincheng Mining Area and to realiz e the mine high production and high efficiency, based on the application experiences of the ZZ6000/17/32 mode hydraulic powered support applied in No.15 seam minin g of Wangtaipu Mine and the mine strata pressure observation information, the powered support stressed conditions in No.2306 coal mining face of the mine were studi ed when the immediate roof initially fell down, the main roof initially pressurized, the main roof pressurized periodically and pressurized non-periodically.A study and an alysis on the insufficient rated working resistances of the support in the coal mining face and the problems existed in the powered support were conducted.The results s howed that the ZY 10000/16/32D mode two legs shield powered support selected for the coal mining face would have good suitability to the mining conditions of No.15 s eam in the mining area.
Abstract：
In order to select a hydraulic powered support suitable for mining conditions of the coal mining face in No. 15 seam of Jincheng Mining Area and to realiz e the mine high production and high efficiency, based on the application experiences of the ZZ6000/17/32 mode hydraulic powered support applied in No.15 seam minin g of Wangtaipu Mine and the mine strata pressure observation information, the powered support stressed conditions in No.2306 coal mining face of the mine were studi ed when the immediate roof initially fell down, the main roof initially pressurized, the main roof pressurized periodically and pressurized non-periodically.A study and an alysis on the insufficient rated working resistances of the support in the coal mining face and the problems existed in the powered support were conducted.The results s howed that the ZY 10000/16/32D mode two legs shield powered support selected for the coal mining face would have good suitability to the mining conditions of No.15 s eam in the mining area.
In order to select a hydraulic powered support suitable for mining conditions of the coal mining face in No. 15 seam of Jincheng Mining Area and to realiz e the mine high production and high efficiency, based on the application experiences of the ZZ6000/17/32 mode hydraulic powered support applied in No.15 seam minin g of Wangtaipu Mine and the mine strata pressure observation information, the powered support stressed conditions in No.2306 coal mining face of the mine were studi ed when the immediate roof initially fell down, the main roof initially pressurized, the main roof pressurized periodically and pressurized non-periodically.A study and an alysis on the insufficient rated working resistances of the support in the coal mining face and the problems existed in the powered support were conducted.The results s howed that the ZY 10000/16/32D mode two legs shield powered support selected for the coal mining face would have good suitability to the mining conditions of No.15 s eam in the mining area.
Abstract：
According to the serious convergence and deformation problems of the roof and floor and the two sidewalls in and along the-650 m railway cross-cut gat eway in Linnancang Mine, the deformation mechanism of the surrounding rock in the gateway was analyzed.It was found that the major features of the gateway were m ulti layers of kaolin base soft rock passed, joint crack development, complicated structure, deep buried depth and gateway deformation with large deformation of broken soft rock under the high stress.Based on the circumstances, a support plan with full cross section concrete pouring was provided.The project monitoring and measuring and the application effects showed that after the support system completed, the convergence of the two sidewalls in the gateway was less than 300 mm and the conver gences of the roof and floor were less than 100 mm. The surrounding rock deformation of the gateway was basically controlled, the stress of the anchored zone was sta ble and the gateway was quickly reached stable in whole.
According to the serious convergence and deformation problems of the roof and floor and the two sidewalls in and along the-650 m railway cross-cut gat eway in Linnancang Mine, the deformation mechanism of the surrounding rock in the gateway was analyzed.It was found that the major features of the gateway were m ulti layers of kaolin base soft rock passed, joint crack development, complicated structure, deep buried depth and gateway deformation with large deformation of broken soft rock under the high stress.Based on the circumstances, a support plan with full cross section concrete pouring was provided.The project monitoring and measuring and the application effects showed that after the support system completed, the convergence of the two sidewalls in the gateway was less than 300 mm and the conver gences of the roof and floor were less than 100 mm. The surrounding rock deformation of the gateway was basically controlled, the stress of the anchored zone was sta ble and the gateway was quickly reached stable in whole.
Abstract：
The gas geological theory and method were applied to analyze the geological factors of Songshuzhen Mine affected to the coal and gas outburst and the gas emission features of the coal mining face.The results showed that the geological structure and coal depth was the major factors to influence gas deposit;coal and g as outburst was controlled mainly by geological structure, in geological structure zone, gas outburst occurred because of the stress concentration, damaged coal struct ure as well as large gas content and high gas pressure;gas emission quantity in goaf accounted for about 46.62% of the quantity in working face. Based on the circumst ances, the optimized ventilation system, improved gas monitoring and prediction, enhanced gas drainage and other comprehensive gas prevention and control measure s were provided and could provide the technical protections to the safety production of Songshuzhen Mine.
The gas geological theory and method were applied to analyze the geological factors of Songshuzhen Mine affected to the coal and gas outburst and the gas emission features of the coal mining face.The results showed that the geological structure and coal depth was the major factors to influence gas deposit;coal and g as outburst was controlled mainly by geological structure, in geological structure zone, gas outburst occurred because of the stress concentration, damaged coal struct ure as well as large gas content and high gas pressure;gas emission quantity in goaf accounted for about 46.62% of the quantity in working face. Based on the circumst ances, the optimized ventilation system, improved gas monitoring and prediction, enhanced gas drainage and other comprehensive gas prevention and control measure s were provided and could provide the technical protections to the safety production of Songshuzhen Mine.
Abstract：
Analyzed the coal outburst mechanism occurred by the structure soft coal zone opened at the cross-cut, according to the outburst high danger and high strength problems occurred by the seam opened at the cross-cut, the pre-cracking blasting with deep boreholes in the structure soft coal zone for the outburst eliminati on and the rapid mine roadway construction technology were provided and the site test research was carried out in Luling Coal Mine.The results showed that with 24 ho urs after the deep borehole blasting, the drained gas volume fraction and the pure flow kept in long time was 23 times higher than the previous. The large cross section r oadway rapid construction technology with U type steel shield support applied could make the gateway cross section increase by 41% and ensured the mine safety prod uction.During the seam opened at cross-cut period, the gas content over the limit and the outburst accident was effectively eliminated, there was no coal wall spalling, r oof leakage and roof failing accident occurred and the time to open the seam reduced by 58 days.
Analyzed the coal outburst mechanism occurred by the structure soft coal zone opened at the cross-cut, according to the outburst high danger and high strength problems occurred by the seam opened at the cross-cut, the pre-cracking blasting with deep boreholes in the structure soft coal zone for the outburst eliminati on and the rapid mine roadway construction technology were provided and the site test research was carried out in Luling Coal Mine.The results showed that with 24 ho urs after the deep borehole blasting, the drained gas volume fraction and the pure flow kept in long time was 23 times higher than the previous. The large cross section r oadway rapid construction technology with U type steel shield support applied could make the gateway cross section increase by 41% and ensured the mine safety prod uction.During the seam opened at cross-cut period, the gas content over the limit and the outburst accident was effectively eliminated, there was no coal wall spalling, r oof leakage and roof failing accident occurred and the time to open the seam reduced by 58 days.
Abstract：
Based on the energy theory, the transient energy variation of the gas outburst was analyzed, a positive effect mathematical physics model of the coal an d gas outburst including the coal and rock elastic energy and gas expansion energy and a negative effect model of coal and rock resisted gas outburst energy was esta blished.According to the coal and rock stress-strain test, the relationship between the force and deformation value of the coal and rock at different deformation stages W as obtained.With the positive effect and negative effect coupling models, the critical gas pressure value to cause the coal and gas outburst under different coal structure combined conditions in Sihe Mine was calculated.The results showed that under the other similar conditions, when the percentage of the soft coal increased, the critical gas pressure value would be reduced with exponential form and the possibility of the coal and gas outburst occurred would be increased.The application of the method could rapidly judge the critical value of the coal and gas outburst occurred and thus the effective measures could be conducted.
Based on the energy theory, the transient energy variation of the gas outburst was analyzed, a positive effect mathematical physics model of the coal an d gas outburst including the coal and rock elastic energy and gas expansion energy and a negative effect model of coal and rock resisted gas outburst energy was esta blished.According to the coal and rock stress-strain test, the relationship between the force and deformation value of the coal and rock at different deformation stages W as obtained.With the positive effect and negative effect coupling models, the critical gas pressure value to cause the coal and gas outburst under different coal structure combined conditions in Sihe Mine was calculated.The results showed that under the other similar conditions, when the percentage of the soft coal increased, the critical gas pressure value would be reduced with exponential form and the possibility of the coal and gas outburst occurred would be increased.The application of the method could rapidly judge the critical value of the coal and gas outburst occurred and thus the effective measures could be conducted.
Abstract：
Taking No.4331 coal mining face in Jinneng Coal Company of Shenning Group as a study object, according to the fluid mechanics and the rock mechani CS theory, a numerical model of the regional gas drainage in the outburst seam was established.The COMSOL Multiphysics software was applied to the numerical calcul ation.The paper discussed the variation law of the gas pressure in the regional seam and the seam crack rate with the gas drainage time.The results showed that the gr oup borehole effect of the regional gas drainage was obvious . After 100 days of the simulated gas drainage, the regional gas pressure in major area was reduced below the critical value of 0.74 MPa.The permeability of the seam would rapidly increase and when the permeability reached to the peak value, the permeability would return t 0 the constant value, which was 4.8% higher than initial porosity.The results would have important theoretical significances to the regional gas prevention and control of No.4331 coal mining face and to the regional outburst prevention measures set up.
Taking No.4331 coal mining face in Jinneng Coal Company of Shenning Group as a study object, according to the fluid mechanics and the rock mechani CS theory, a numerical model of the regional gas drainage in the outburst seam was established.The COMSOL Multiphysics software was applied to the numerical calcul ation.The paper discussed the variation law of the gas pressure in the regional seam and the seam crack rate with the gas drainage time.The results showed that the gr oup borehole effect of the regional gas drainage was obvious . After 100 days of the simulated gas drainage, the regional gas pressure in major area was reduced below the critical value of 0.74 MPa.The permeability of the seam would rapidly increase and when the permeability reached to the peak value, the permeability would return t 0 the constant value, which was 4.8% higher than initial porosity.The results would have important theoretical significances to the regional gas prevention and control of No.4331 coal mining face and to the regional outburst prevention measures set up.
Abstract：
With the deep study on the node location method, great programming practices showed that the original node location method algorithm was not complet ed and would often cause wrong distinguished phenomena.Thus an improved method was provided and a completed program diagram was provided.The application of t he improved node location method showed that as for a same scale ventilation network, the wrong distinguishing rate of the original node location method was high and was 39.8%. The wrong distinguishing rate of the improved node location method was 0.The improved node location method could rapidly and accurately distinguish the diagonal air way and could be widely applied to analyze the reliability and stability of the mine ventilation system.
With the deep study on the node location method, great programming practices showed that the original node location method algorithm was not complet ed and would often cause wrong distinguished phenomena.Thus an improved method was provided and a completed program diagram was provided.The application of t he improved node location method showed that as for a same scale ventilation network, the wrong distinguishing rate of the original node location method was high and was 39.8%. The wrong distinguishing rate of the improved node location method was 0.The improved node location method could rapidly and accurately distinguish the diagonal air way and could be widely applied to analyze the reliability and stability of the mine ventilation system.
Abstract：
According to The Construction and Management Temporary Provisions of Mine Emergent Refuge System, a study was conducted on the power supply sy stem of the mine permanent refuge chamber in Wulan Mine .A double power supply system was designed and thus the mine electric power and the electric power in surf ace borehole could be automatically switched within five seconds.With the analysis on the gas explosion disasters occurred in the underground mine, the protection me asures of the underground electric cables with a buried depth of 500 mm were provided.Based on the power of the equipment in the chamber clarified, the voltage lost 0 f the cable should be calculated and the distance between the surface cable and the underground cable to the refuge chamber should not be over 1 500 m.Meanwhile, a plan of the surface borehole and the inner casing pipe layout was provided and the down setting method and fixed method of the cable in the borehole were determin ed.The safety power supply of the chamber site confirmed the feasibility of the power supply system.
According to The Construction and Management Temporary Provisions of Mine Emergent Refuge System, a study was conducted on the power supply sy stem of the mine permanent refuge chamber in Wulan Mine .A double power supply system was designed and thus the mine electric power and the electric power in surf ace borehole could be automatically switched within five seconds.With the analysis on the gas explosion disasters occurred in the underground mine, the protection me asures of the underground electric cables with a buried depth of 500 mm were provided.Based on the power of the equipment in the chamber clarified, the voltage lost 0 f the cable should be calculated and the distance between the surface cable and the underground cable to the refuge chamber should not be over 1 500 m.Meanwhile, a plan of the surface borehole and the inner casing pipe layout was provided and the down setting method and fixed method of the cable in the borehole were determin ed.The safety power supply of the chamber site confirmed the feasibility of the power supply system.
Abstract：
In order to improve the adjustment operation economy of the ventilator, a flap adjustment was conducted on the centrifugal impeller.A study was made 0 n the flap and front guider adjustment of the centrifugal ventilator, the running blade adjustment of the axial ventilator, and the ventilator efficiency, pipeline efficiency, s ystem efficiency and energy saving efficiency during the throttle adjustment.A comprehensive feature curve of the operation economy for the adjustment was obtained.T he study results showed that when the flow variation of the ventilator was at 66.3% 1 13.8%, during the flap adjustment, the average system efficiency of the ventilator W ould be higher than 79.9%, the average adjustment efficiency would be higher than 91.9% and generally the system efficiency and adjustment efficiency would be high t han the running blade adjustment and the front guider adjustment.When the flow of the ventilator was highly reduced, the advantage of the flap adjustment would be ob vious.Meanwhile the G4-73 centrifugal ventilator with the front guider was replaced with flap adjustment, when the flow reduced to 70%, the energy saving rate would b e 28.9%.Thus the operation economy of the centrifugal fan with the flap adjustment would be good.
In order to improve the adjustment operation economy of the ventilator, a flap adjustment was conducted on the centrifugal impeller.A study was made 0 n the flap and front guider adjustment of the centrifugal ventilator, the running blade adjustment of the axial ventilator, and the ventilator efficiency, pipeline efficiency, s ystem efficiency and energy saving efficiency during the throttle adjustment.A comprehensive feature curve of the operation economy for the adjustment was obtained.T he study results showed that when the flow variation of the ventilator was at 66.3% 1 13.8%, during the flap adjustment, the average system efficiency of the ventilator W ould be higher than 79.9%, the average adjustment efficiency would be higher than 91.9% and generally the system efficiency and adjustment efficiency would be high t han the running blade adjustment and the front guider adjustment.When the flow of the ventilator was highly reduced, the advantage of the flap adjustment would be ob vious.Meanwhile the G4-73 centrifugal ventilator with the front guider was replaced with flap adjustment, when the flow reduced to 70%, the energy saving rate would b e 28.9%.Thus the operation economy of the centrifugal fan with the flap adjustment would be good.
Abstract：
According to the low dilling efficiency, low automation level, poor accident handling capacity and other problems existed in the rotary table driling machi ne for mine freezing and grouting application, a control system of the top drive drilling machine for the mine freezing and grouting with a human and interface technolog y was designed based on the programming controller PLC.The paper in detail introduced the certain implementation processes and working principles of the stepless sp eed regulating of the control system, the automatic screw-on-off, automatic rod feeding, monitoring and control alarm and accident handling functions.Meanwhile the pa per introduced the structure principle of the drilling platform- -the key equipment in the control system.The system measured results showed that the control system cou Id highly reduce the drilling time, highly improve the drilling efficiency and the accident handling capacity.
According to the low dilling efficiency, low automation level, poor accident handling capacity and other problems existed in the rotary table driling machi ne for mine freezing and grouting application, a control system of the top drive drilling machine for the mine freezing and grouting with a human and interface technolog y was designed based on the programming controller PLC.The paper in detail introduced the certain implementation processes and working principles of the stepless sp eed regulating of the control system, the automatic screw-on-off, automatic rod feeding, monitoring and control alarm and accident handling functions.Meanwhile the pa per introduced the structure principle of the drilling platform- -the key equipment in the control system.The system measured results showed that the control system cou Id highly reduce the drilling time, highly improve the drilling efficiency and the accident handling capacity.
Abstract：
In order to accurately master the working status of the brake in the mine hoist, the analytic hierarchy process and the fuzzy comprehensive judgment me thod were applied to the study on the relability judgment of the brake in the mine hoist.With a general design conducted on the judgment system, a judgment system m odel was established.The paper stated the certain judgment process.The case verification was conducted on the brake of a hoist.The results showed that the judgment system could accurately and high efficiently judge the reliability of the brake.The safety status grade of the brake was obtained and the safety hidden danger existed in the brake could be timely found, which could provide the reliable guarantee to the mine safety production.
In order to accurately master the working status of the brake in the mine hoist, the analytic hierarchy process and the fuzzy comprehensive judgment me thod were applied to the study on the relability judgment of the brake in the mine hoist.With a general design conducted on the judgment system, a judgment system m odel was established.The paper stated the certain judgment process.The case verification was conducted on the brake of a hoist.The results showed that the judgment system could accurately and high efficiently judge the reliability of the brake.The safety status grade of the brake was obtained and the safety hidden danger existed in the brake could be timely found, which could provide the reliable guarantee to the mine safety production.
Abstract：
In order to make the surface production management department to effectively monitor and manage the environment in the underground mine, with the a pplication of the available covered wireless network in the underground mine and in combination with the WCF data transmission technology, a mine safety patrol mana gement system was designed and realized.With mobile terminal equipment, the system could rapidly and correctly transmit the underground mine environment paramet ers, three violation information and images collected from the mine patrol in the underground mine to the surface servers.Meanwhile a statistic analysis would be effecti vely conducted by the surface server, the underground mine environment conditions could be timely reflected.The design of the system could improve the working envir onment safety coefficient of the mine workers, could effectively promote the standardization and informationization of the mine safety patrol work and could upgrade the work efficiency and management level of the mine management personnel.
In order to make the surface production management department to effectively monitor and manage the environment in the underground mine, with the a pplication of the available covered wireless network in the underground mine and in combination with the WCF data transmission technology, a mine safety patrol mana gement system was designed and realized.With mobile terminal equipment, the system could rapidly and correctly transmit the underground mine environment paramet ers, three violation information and images collected from the mine patrol in the underground mine to the surface servers.Meanwhile a statistic analysis would be effecti vely conducted by the surface server, the underground mine environment conditions could be timely reflected.The design of the system could improve the working envir onment safety coefficient of the mine workers, could effectively promote the standardization and informationization of the mine safety patrol work and could upgrade the work efficiency and management level of the mine management personnel.
Abstract：
Based on the analysis on the problems existed in the layout of the traditional observation station and the data processing, a calculation method of the an y direction horizontal moving value was provided.A mining curved surface of the rectangular coal mining face ftting the subsidence and horizontal moving function mod el was established.The paper studied the vertical offset coefficient affected to the main influence radius occurred. The predicted parameters obtained from the curve ftti ng and nonlinear curve ftting were compared and analyzed.The results showed that when the vertical offset cofficient was smaller than a fixed value, the offset occurr ed by the average mining depth replaced to the strike main cross section mining depth would not be over 10% .Otherwise the influence caused by the main influence rad ius should be considered.In comparison with the nonlinear curve ftting, the accuracy of the horizontal moving coefficient in dip and rise direction could be improved by 6.3% and 3.3% individually.The tangent accuracy of the main influence angle was individually improved by 3.6% and 6.0%.The ftting accuracy of the propagation angle coefficient affected by the mining was improved by 13.3%.Thus the ftting results would not be restricted by the mining of the coal mining face.
Based on the analysis on the problems existed in the layout of the traditional observation station and the data processing, a calculation method of the an y direction horizontal moving value was provided.A mining curved surface of the rectangular coal mining face ftting the subsidence and horizontal moving function mod el was established.The paper studied the vertical offset coefficient affected to the main influence radius occurred. The predicted parameters obtained from the curve ftti ng and nonlinear curve ftting were compared and analyzed.The results showed that when the vertical offset cofficient was smaller than a fixed value, the offset occurr ed by the average mining depth replaced to the strike main cross section mining depth would not be over 10% .Otherwise the influence caused by the main influence rad ius should be considered.In comparison with the nonlinear curve ftting, the accuracy of the horizontal moving coefficient in dip and rise direction could be improved by 6.3% and 3.3% individually.The tangent accuracy of the main influence angle was individually improved by 3.6% and 6.0%.The ftting accuracy of the propagation angle coefficient affected by the mining was improved by 13.3%.Thus the ftting results would not be restricted by the mining of the coal mining face.
Abstract：
According to the first aquifer (the porous aquifer of the Permian red base rock) in the mine auxillary shaft of Zhuji Mine, after the pr-grouting at the surfa ce ground, the grouting at the shaft sinking face when water flow occurred during the shaft sinking and other measures conducted, the status of the water flow control r equirements could not be met.The paper analyzed the water inrush speciality cause of the aquifer.The results showed that the aquifer of the Permian red base rock was the porous aquifer of the base rock.Under the in-situ surrounding rock pressure, there was a high absorbability between the pore framework of the base rock and the po rous water and the permeability coefficient was 10-510-3 m/d.When the surrounding rock pressure suddenly reduced, the permeability coefficient would be increased by several 100 times and the weak aquifer would be turned to be a high water inrush aquifer with continued water flowing.Thus when the application of the surface powerfu . I pre-grouting and the proper related grouting were all difficult to control the water inrush, the ground freezing and other control measures should be applied.
According to the first aquifer (the porous aquifer of the Permian red base rock) in the mine auxillary shaft of Zhuji Mine, after the pr-grouting at the surfa ce ground, the grouting at the shaft sinking face when water flow occurred during the shaft sinking and other measures conducted, the status of the water flow control r equirements could not be met.The paper analyzed the water inrush speciality cause of the aquifer.The results showed that the aquifer of the Permian red base rock was the porous aquifer of the base rock.Under the in-situ surrounding rock pressure, there was a high absorbability between the pore framework of the base rock and the po rous water and the permeability coefficient was 10-510-3 m/d.When the surrounding rock pressure suddenly reduced, the permeability coefficient would be increased by several 100 times and the weak aquifer would be turned to be a high water inrush aquifer with continued water flowing.Thus when the application of the surface powerfu . I pre-grouting and the proper related grouting were all difficult to control the water inrush, the ground freezing and other control measures should be applied.
Abstract：
In order to be favorable to water drainage and pumping in coal mines of North China karst water flling, the balanced principle was applied to analyze the composition of the mine water inflow during the mine water drainage and pumping.Three water table dynamic variation curves normally occurred in the mine water drain age and pumping were summarized, including the rapid reduced and rapid stable type curve of the watery aquifer with weak rich water flled, the vertical dropped curve of the aquifer with poor watery and less water flld and a stable sectional reduced curve of the aquifer with high watery and high water flled.In combination with the mi ne water prevention and control cases of four large karst water flling mines, based on the water table drop and the water inflow value ratio obtained from the large water pumping test as the evaluation index, the suitability of the mine water drainage and water pressure drop was studied and could provide the references to the mine wat er drainage and water pumping.
In order to be favorable to water drainage and pumping in coal mines of North China karst water flling, the balanced principle was applied to analyze the composition of the mine water inflow during the mine water drainage and pumping.Three water table dynamic variation curves normally occurred in the mine water drain age and pumping were summarized, including the rapid reduced and rapid stable type curve of the watery aquifer with weak rich water flled, the vertical dropped curve of the aquifer with poor watery and less water flld and a stable sectional reduced curve of the aquifer with high watery and high water flled.In combination with the mi ne water prevention and control cases of four large karst water flling mines, based on the water table drop and the water inflow value ratio obtained from the large water pumping test as the evaluation index, the suitability of the mine water drainage and water pressure drop was studied and could provide the references to the mine wat er drainage and water pumping.
Abstract：
In order to provide technical parameters to prepare the carbon molecular sieve applied to CH4/N2 separation, the paper investigated carbon temperature s of 450, 500, 550, 600 and 650。C affected to the performance of the carbon molecular sieve applied to the CH4/N2 separation. The results showed that the adsorption volume and the balanced separation coefficient both would be increased with the carbon deposition temperature increased and then would be decreased in tendency.W hen the deposition temperature was at 550。C, the performance of the carbon molecular sieve would be optimum, the max adsorption volume of CH4 was 1.41 mmol/g a nd the balanced separation coefficient of CH4/N2 was 4.74.The adsorption/desorption isotherm of nitrogen showed that the carbon molecular sieve sample prepared un der the such conditions was micropore mainly.
In order to provide technical parameters to prepare the carbon molecular sieve applied to CH4/N2 separation, the paper investigated carbon temperature s of 450, 500, 550, 600 and 650。C affected to the performance of the carbon molecular sieve applied to the CH4/N2 separation. The results showed that the adsorption volume and the balanced separation coefficient both would be increased with the carbon deposition temperature increased and then would be decreased in tendency.W hen the deposition temperature was at 550。C, the performance of the carbon molecular sieve would be optimum, the max adsorption volume of CH4 was 1.41 mmol/g a nd the balanced separation coefficient of CH4/N2 was 4.74.The adsorption/desorption isotherm of nitrogen showed that the carbon molecular sieve sample prepared un der the such conditions was micropore mainly.
Abstract：
The 3D electrode combined Fenton reagent was applied to the deep treatment of the coking waste water after the secondary biochemistry treatment.Und er the certain condition of the 3D electrode parameters, the factors affected to the TOC removal rate of the waste water and the waste water treatment effect were inves tigated and a comparison was conducted to the TOC removal effect of the conventional 3D electrode method.With the single factor experiments conducted, the optimum value of each parameter in the reaction system was determined as the followings: the pH value was 3.5, the H2O2 added value was 17.6 mmol/L, the reaction time was 90 min and the FeSO4.7H2O added value was 3.5 mmol/L.Under the circumstances, the TOC removal rate could be reached at 51.7%.The results of the ultraviolet abs orption spectrum analysis showed that the degradation and mineralization occurred on the organics in the waste water and thus could provide the reference basis to the 3D electrode combined Fenton reagent technology applied to the deep treatment of the coking waste water.
The 3D electrode combined Fenton reagent was applied to the deep treatment of the coking waste water after the secondary biochemistry treatment.Und er the certain condition of the 3D electrode parameters, the factors affected to the TOC removal rate of the waste water and the waste water treatment effect were inves tigated and a comparison was conducted to the TOC removal effect of the conventional 3D electrode method.With the single factor experiments conducted, the optimum value of each parameter in the reaction system was determined as the followings: the pH value was 3.5, the H2O2 added value was 17.6 mmol/L, the reaction time was 90 min and the FeSO4.7H2O added value was 3.5 mmol/L.Under the circumstances, the TOC removal rate could be reached at 51.7%.The results of the ultraviolet abs orption spectrum analysis showed that the degradation and mineralization occurred on the organics in the waste water and thus could provide the reference basis to the 3D electrode combined Fenton reagent technology applied to the deep treatment of the coking waste water.
Abstract：
Due to the coarse particles were heavy and had a low probability to the bubble collision in the conventional floatation,once sticking on the bubbles,the p articles would be easily detached from the bubbles by the strong turbulence movement of slurry.In combination with the floatation features of the coarse and fine particl e minerals,a wide particle grade coal floatator suitable for coarse and fine minerals separation was designed.The FLUENT software was applied to the numerical simula tion study on the gas-fluid two phase flow filed of the floatator.With the analysis on the inner fluid velocity,turbulence intensity and gas-phase concentration of the floata tor,the structure floatator was approved to provide each fluid dynamics environment required for the coarse and fine coal floatation.A wide particle grade slime floatation experiment system set in the lab was applied to the floatation experiment on the slime with 01 mm in Zhangcun Mine Coal Preparation Plant. The results showed that wit h a suitable floatation technique condition selected,when the floatator was applied to the floatation of the 01 mm wide grade slime,the quantity index of the floated clean coal and the combustible mass recovery rate were 96.33% and 92.07 % individually.
Due to the coarse particles were heavy and had a low probability to the bubble collision in the conventional floatation,once sticking on the bubbles,the p articles would be easily detached from the bubbles by the strong turbulence movement of slurry.In combination with the floatation features of the coarse and fine particl e minerals,a wide particle grade coal floatator suitable for coarse and fine minerals separation was designed.The FLUENT software was applied to the numerical simula tion study on the gas-fluid two phase flow filed of the floatator.With the analysis on the inner fluid velocity,turbulence intensity and gas-phase concentration of the floata tor,the structure floatator was approved to provide each fluid dynamics environment required for the coarse and fine coal floatation.A wide particle grade slime floatation experiment system set in the lab was applied to the floatation experiment on the slime with 01 mm in Zhangcun Mine Coal Preparation Plant. The results showed that wit h a suitable floatation technique condition selected,when the floatator was applied to the floatation of the 01 mm wide grade slime,the quantity index of the floated clean coal and the combustible mass recovery rate were 96.33% and 92.07 % individually.
Abstract：
In order to solve the paddy field subsidence and failure caused by the coal mining subsidence in the southwest part of China, to recovery the water holdi ng capacity of the water insolated stratum for the paddy fields in the mining subsidence area and to reconstruct the water insolated stratum in the soil, ground radar and high density electric method were applied to the site exploration.In combination with the regional features, the failure features of the paddy field subsidence area were i nvestigated.The paddy field failure way and the water leakage features of the paddy field in the mining subsidence of Southwest China were summarized.The water lea kage mechanism was analyzed.The results showed that the mining subsidence in Southwest China would cause the underground water dropping, the surface ground cr acking and others.The paddy field failures in the mining subsidence area would have the subsidence field, water leakage field and land cracking field.The site investigat ion and the exploration held the coal mining subsidence affected to the water keeping function of the paddy field insolated stratum would be the main reason to cause t he paddy field water leakage in the subsidence area.
In order to solve the paddy field subsidence and failure caused by the coal mining subsidence in the southwest part of China, to recovery the water holdi ng capacity of the water insolated stratum for the paddy fields in the mining subsidence area and to reconstruct the water insolated stratum in the soil, ground radar and high density electric method were applied to the site exploration.In combination with the regional features, the failure features of the paddy field subsidence area were i nvestigated.The paddy field failure way and the water leakage features of the paddy field in the mining subsidence of Southwest China were summarized.The water lea kage mechanism was analyzed.The results showed that the mining subsidence in Southwest China would cause the underground water dropping, the surface ground cr acking and others.The paddy field failures in the mining subsidence area would have the subsidence field, water leakage field and land cracking field.The site investigat ion and the exploration held the coal mining subsidence affected to the water keeping function of the paddy field insolated stratum would be the main reason to cause t he paddy field water leakage in the subsidence area.
