| Citation: |
HUO Bingjie，MENG Fanlu，LI Tianhang，et al. Small coal pillar technology in fully-mechanized top-coal caving face of multi layer hard roof and extra thick coal seam[J]. Coal Science and Technology，2024，52（3）：13−23. DOI: 10.13199/j.cnki.cst.2023-0599
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In order to study the stability of small coal pillar roadway protection and its characteristics of blocking disasters in adjacent goaf areas at the same layer, the mining of extra-thick coal seams with hard roofs in the Carboniferous mining area in Datong Mining Area was used as the engineering background, and theoretical analysis, experimental research, numerical simulation, etc. were used. From the two perspectives of the stability of the small coal pillar roadway protection tunnel and its ability to block harmful gases in adjacent goaf areas at the same layer, a comprehensive analysis is made of the reasonable size of the small coal pillar and the evolution characteristics of its permeability in different mining stages. Aiming at the specific mining conditions of small coal pillar mining in gob-side entry driving in 8210 working face of Carboniferous coal seam in Tongxin Coal Mine, a mechanical model of superposition of internal and external stress fields in double key strata is established, and the calculation formula of reasonable size of small coal pillar in gob-side entry driving under the condition of double key strata is deduced. The reasonable size of small coal pillar in 8210 working face is theoretically determined to be 6.0 m. The permeability evolution characteristics of small coal pillars in different mining stages were studied by using DJG–II coal rock seepage test equipment. It was determined that the permeability of small coal pillars in the third mining stage was 23 times higher than that in the initial test, and the small coal pillars in this stage basically lost the ability to block the harmful gases in the adjacent goaf. According to the theoretical research results, 6 m small coal pillars were selected for industrial test. According to the experimental results, during the mining test, the small coal pillar was modified to reduce the permeability, and the thick layer concrete (100 mm) was sprayed on the surface and roof of the small coal pillar within 1 500 mm from the coal pillar. The practice shows that a certain amount of deformation has occurred in the mining roadway of the small coal pillar roadway protection during the mining process of the working face, but the deformation of the roadway is within the safe and controllable range, the roadway is stable, and safe mining can be realized; during the mining process, the CH4 gas concentration in the upper corner of the 8210 working face is much lower than that in the goaf of the adjacent 8305 working face, indicating that the small coal pillar has the ability to block the harmful gas in the adjacent goaf of the same layer after the modification and permeability reduction. The mining practice also further verifies the rationality and scientificity of the theoretical and experimental research results. The research results can provide reference for the popularization and application of small coal pillar roadway protection technology under similar conditions.
| [1] |
王 恩,谢生荣,陈冬冬,等. 深部孤岛工作面留小煤柱掘巷围岩破坏机制与控制[J]. 煤炭科学技术,2023,51(11):41−50.
WANG En,XIE Shengrong,CHEN Dongdong,et al. Failure mechanism and its control of surrounding rock for gob-side entry driving with narrow coal pillar in the working face with goaf on both sides[J]. Coal Science and Technology,2023,51(11):41−50.
|
| [2] |
赵鹏翔,李 刚,李树刚,等. 倾斜厚煤层沿空掘巷煤柱力学特征的尺寸效应分析[J]. 采矿与安全工程学报,2019,36(6):1120−1127.
ZHAO Pengxiang,LI Gang,LI Shugang,et al. Analysis of size effect of mechanical characteristics of coal pillars gob-side entry in inclined thick coal seam[J]. Journal of Mining and Safety Engineering,2019,36(6):1120−1127.
|
| [3] |
王志强,石 磊,孙中文,等. 厚煤层巷道煤柱留设及沿空巷道围岩控制机理研究[J]. 煤矿安全,2018,49(8):48−52.
WANG Zhiqiang,SHI Lei,SUN Zhongwen,et al. Coal pillar remaining of thick coal seam roadway and surrounding rock control mechanism of gob-side entry[J]. Safety in Coal Mines,2018,49(8):48−52.
|
| [4] |
何文瑞,何富连,陈冬冬,等. 坚硬厚基本顶特厚煤层综放沿空掘巷煤柱宽度与围岩控制[J]. 采矿与安全工程学报,2020,37(2):349−358,365.
HE Wenrui,HE Fulian,CHEN Dongdong et al. Pillar width and surrounding rock control of gob-side roadway with mechanical caved mining in extra-thick coal seams under hard-thick main roof[J]. Journal of Mining and Safety Engineering,2020,37(2):349−358,365.
|
| [5] |
刘垚鑫,高明仕,贺永亮,等. 倾斜特厚煤层综放沿空掘巷围岩稳定性研究[J]. 中国矿业大学学报,2021,50(6):1051−1059.
LIU Yaoxin,GAO Mingshi,HE Yongliang,et al. Study of control technology about gob-side entry driving with top-coal caving in inclined extra-thick coal seam[J]. Journal of China University of Mining & Technology,2021,50(6):1051−1059.
|
| [6] |
徐 超,李小芳,王 凯,等. 高瓦斯煤层群保护层工作面留设煤柱合理宽度[J]. 中国矿业大学学报,2020,49(3):445−452.
XU Chao,LI Xiaofang,WANG Kai,et al. Reasonable coal pillar width of protective layer during high-gas coal seams mining[J]. Journal of China University of Mining & Technology,2020,49(3):445−452.
|
| [7] |
蒋 威,鞠文君,汪占领,等. 厚硬基本顶综放沿空巷道覆岩应力分布特征及合理煤柱宽度确定[J]. 采矿与安全工程学报,2020,37(6):1142−1151.
JIANG Wei,JU Wenjun,WANG Zhanling,et al. Characteristics of overburden stress distribution and rational pillar width determination of gob-side roadway with thick and hard basic roof in fully mechanized top coal caving workface[J]. Journal of Mining and Safety Engineering,2020,37(6):1142−1151.
|
| [8] |
姜耀东,宋红华,马振乾,等. 基于地应力反演的构造应力区沿空巷道窄煤柱宽度优化研究[J]. 煤炭学报,2018,43(2):319−326.
JIANG Yaodong,SONG Honghua,MA Zhenqian,et al. Optimization research on the width of narrow coal pillar along goaf tunnel in tectonic stress zone[J]. Journal of China Coal Society,2018,43(2):319−326.
|
| [9] |
何满潮,高玉兵,盖秋凯,等. 无煤柱自成巷力学原理及其工法[J]. 煤炭科学技术,2023,51(1):19−30.
HE Manchao,GAO Yubing,GAI Qiukai,et al. Mechanical principle and mining methods of automagical entry formation without coal pillars[J]. Coal Science and Technology,2023,51(1):19−30.
|
| [10] |
郝晓琦,韩 刚,解嘉豪,等. 鄂尔多斯矿区小煤柱沿空掘巷冲击地压机理[J]. 采矿与岩层控制工程学报,2023,5(2):023017.
HAO Xiaoqi,HAN Gang,XIE Jiahao,et al. Rock burst mechanism of roadway excavation along goaf with small coal pillar in Ordos mining area[J]. Journal of Mining and Strata Control Engineering,2023,5(2):023017.
|
| [11] |
谷长宛,王 波,王 军,等. 基于胀锁式对穿锚索的沿空掘巷窄煤柱双向加固机理研究[J]. 煤炭科学技术,2022,50(4):106−116.
GU Changwan,WANG Bo,WANG Jun,et al. Research on bidirectional-reinforcement mechanism of narrow coal pillar of gob-side entry driving based on inflatable lock-type anchor[J]. Coal Science and Technology,2022,50(4):106−116.
|
| [12] |
王辰霖,张小东,李贵中,等. 循环加卸载作用下不同高度煤样渗透性试验研究[J]. 岩石力学与工程学报,2018,37(10):2299−2308.
WANG Chenlin,ZHANG Xiaodong,LI Guizhong,et al. Experimental study on the permeability of coal samples with different heights under cyclic loading and unloading[J]. Chinese Journal of Rock Mechanics and Engineering,2018,37(10):2299−2308.
|
| [13] |
刘永茜. 循环载荷作用下煤体渗透率演化的实验分析[J]. 煤炭学报,2019,44(8):2579−2588.
LIU Yongqian. Experimental analysis of coal permeability evolution under cyclic loading[J]. Journal of China Coal Society,2019,44(8):2579−2588.
|
| [14] |
贾恒义,王 凯,王益博,等. 围压循环加卸载作用下含瓦斯煤样渗透特性试验研究[J]. 煤炭学报,2020,45(5):1710−1718.
JIA Hengyi,WANG Kai,WANG Yibo,et al. Permeability characteristics of gas-bearing coal specimens under cyclic loading-unloading of confining pressure[J]. Journal of China Coal Society,2020,45(5):1710−1718.
|
| [15] |
白 鑫,王登科,田富超,等. 三轴应力加卸载作用下损伤煤岩渗透率模型研究[J]. 岩石力学与工程学报,2021,40(8):1536−1546.
BAI Xin,WANG Dengke,TAIN Fuchao,et al. Permeability model of damaged coal under triaxial stress loading-unloading[J]. Chinese Journal of Rock Mechanics and Engineering,2021,40(8):1536−1546.
|
| [16] |
李清淼,梁运培,邹全乐. 循环加卸载路径下不同含瓦斯煤渗流及损伤演化特征[J]. 煤炭学报,2019,44(9):2803−2815.
LI Qingmiao,LIANG Yunpei,ZOU Quanle. Seepage and damage evolution characteristics of different gas-bearing coal under cyclic loading-unloading conditions[J]. Journal of China Coal Society,2019,44(9):2803−2815.
|
| [17] |
王登科,田晓瑞,魏建平,等. 基于工业CT扫描和LBM方法的含瓦斯煤裂隙演化与渗流特性研究[J]. 采矿与安全工程学报,2022,39(2):387−395.
WANG Dengke,TIAN Xiaorui,WEI Jianping,et al. Fracture evolution and permeability characteristics in gas-bearing coal based on industrial CT scanning and LBM method[J]. Journal of Mining and Safety Engineering,2022,39(2):387−395.
|
| [18] |
李云鹏,张宏伟,陈 蓥,等. 同忻井田地应力测量与回采巷道稳定性研究[J]. 安全与环境学报,2017,17(2):468−472.
LI Yunpeng,ZHANG Hongwei,CHEN Ying,et al. In-situ stress measurement and the stability of the mining roadway in Tongxin mine field[J]. Journal of Safety and Environment,2017,17(2):468−472.
|
| [19] |
何富连,卢 恒,秦宾宾,等. 特厚煤层综放沿空巷道煤柱合理宽度与巷道支护研究[J]. 煤炭工程,2021,53(9):30−35.
HE Fulian,LU Heng,QIN Binbin,et al. Reasonable width of coal pillar and roadway support in gob side entry of fully mechanized top coal caving in extra thick coal seam[J]. Coal Engineering,2021,53(9):30−35.
|
| [20] |
靖洪文,苏海健,史新帅,等. 基于井下钻孔剪切的煤矿巷道围岩强度演化规律研究[J]. 岩石力学与工程学报,2019,38(12):2428−2437.
JING Hongwen,SU Haijian,SHI Xinshuai,et al. Study on the strength evolution rule of surrounding rock mass in roadways based on the in-situ borehole shear method[J]. Chinese Journal of Rock Mechanics and Engineering,2019,38(12):2428−2437.
|
| [21] |
伍永平,解盘石,王红伟,等. 大倾角煤层开采覆岩空间倾斜砌体结构[J]. 煤炭学报,2010,35(8):1252−1256.
WU Yongping,JIE Panshi,WANG Hongwei,et al. Incline masonry structure around the coal face of steeply dipping seam mining[J]. Journal of China Coal Society,2010,35(8):1252−1256.
|
| [22] |
B T Brady. Theroy of earthquakes [J]. Pure and Applied Geophysics,1974: 112(4): 701−725.
|
| [23] |
XIANG Li,HEINZ Konietzky,XIBING Li,et al. Failure pattern of brittle rock governed by initial microcrack characteristics[J]. Acta Geotechnica,2018(4): 1437−1457.
|
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