| Citation: |
YANG Huan，ZHENG Kaige，LI Bingang，et al. Disaster mechanism during passing of working face under overlying remnant coal pillar and advanced regional prevention technology[J]. Coal Science and Technology，2023，51（9）：46−54. DOI: 10.12438/cst.2022-1373
|
When the mining of the underlying working face of shallow and close seam passes under the overlying remnant coal pillar, it is easy to have an intensive mine pressure-induced dynamic disaster, resulting in personnel and equipment damage, which seriously threatens the safety of mine production. The characteristics induction, numerical simulation calculation, mechanical model analysis and other research methods are used to clarify the occurrence of the hazards of the overlying remnant coal pillars in the shallow and close seams, and reveal the disaster mechanism caused by intensive mining pressure. The research shows that the disaster mechanism of the intensive ground pressure caused by the overlying remnant coal pillar is that when the working face passes under the coal pillar, the coal pillar and the overlying bearing body are disturbed and suddenly lose stability, and the energy is transferred to the stope instantly, which is released in the form of kinetic energy, resulting in the intensive ground pressure-induced dynamic disaster. Based on the prevention and control idea of “collapsed rock support+weakening of key rock stratum+transfer of stress transmission path”, the prevention and control technology of weakening for front area using subsectional-hydraulic fracturing was proposed by modifying the coal pillar and bearing body migration space, weakening key rock stratum, uniformly distributing concentrated stress and transferring stress transmission path, and engineering tests are carried out at typical working faces. The engineering test results show that during the implementation of hydraulic fracturing, the peak value of pumping pressure reaches 23.4 MPa, the pressure changes generally in a “zigzag” shape, accompanied by a sudden drop of pressure for more than 60 times, and the artificial main fractures and micro fractures in the rock mass continue to develop alternately, effectively destroying the integrity of the rock mass; After treatment, the peak value and average value of periodic pressure decreased by 15.41% and 8.29% respectively, and the peak value and average dynamic load coefficient decreased by 17.39% and 11.88%, respectively. The maximum contraction of the shield cylinder was 50.00% and less than 0.4 m, and the maximum contraction of the gate road roof was 33.33%. The working face safely passed through the affected area of the overlying remnant coal pillar, and the advanced area weakening technology of subsectional- hydraulic fracturing can effectively prevent and control the intensive ground pressure disaster of the overlying remnant coal pillar in shallow and close seams.
| [1] |
郑凯歌,杨俊哲,李彬刚,等. 基于垮落充填的坚硬顶板分段压裂弱化解危技术[J]. 煤田地质与勘探,2021,49(5):77−87. doi: 10.3969/j.issn.1001-1986.2021.05.009
ZHENG Kaige,YANG Junzhe,LI Bingang,et al. Collapse filling-based technology of weakening and danger-solving by staged fracturing in hard roof[J]. Coal Geology & Exploration,2021,49(5):77−87. doi: 10.3969/j.issn.1001-1986.2021.05.009
|
| [2] |
付兴玉,李宏艳,李凤明,等. 房式采空区集中煤柱诱发动载矿压机理及防治[J]. 煤炭学报,2016,41(6):1375−1383. doi: 10.13225/j.cnki.jccs.2015.0880
FU Xingyu,LI Hongyan,LI Fengming,et al. Mechanism and prevention of strong strata behaviors induced by the concentration coal pillar of a room mining goaf[J]. Journal of China Coal Society,2016,41(6):1375−1383. doi: 10.13225/j.cnki.jccs.2015.0880
|
| [3] |
李浩荡,杨汉宏,张 斌,等. 浅埋房式采空区集中煤柱下综采动载控制研究[J]. 煤炭学报,2015,40(S1):6−11. doi: 10.13225/j.cnki.jccs.2014.1066
LI Haodang,YANG Hanhong,ZHANG Bin,et al. Control study of strong strata behaviors during the fully mechanized working face out of con-centrated coal pillar in a shallow depth seam in proximity beneath a room mining goaf[J]. Journal of China Coal Society,2015,40(S1):6−11. doi: 10.13225/j.cnki.jccs.2014.1066
|
| [4] |
田 臣,刘英杰,周海丰. 综采工作面回采过上覆集中煤柱及采空区技术[J]. 煤炭科学技术,2014,42(8):125−128,124. doi: 10.13199/j.cnki.cst.2014.08.031
TIAN Cheng,LIU Yingjie,ZHOU Haifeng. Technology of fully-mechanized coal mining face passing through overburden concentrated coal pillar and goaf[J]. Coal Science and Technology,2014,42(8):125−128,124. doi: 10.13199/j.cnki.cst.2014.08.031
|
| [5] |
郑凯歌. 碎软低透煤层底板梳状长钻孔分段水力压裂增透技术研究[J]. 采矿与安全工程学报,2020,37(2):272−281. doi: 10.13545/j.cnki.jmse.2020.02.007
ZHENG Kaige. Permeability improving technology by sectional hydraulic fracturing for comb-like long drilling in floor of crushed and soft coal seam with low permeability[J]. Journal of Mining & Safety Engineering,2020,37(2):272−281. doi: 10.13545/j.cnki.jmse.2020.02.007
|
| [6] |
杨俊哲, 郑凯歌, 赵继展, 等. 浅埋近距离上覆遗留煤柱应力集中灾害压裂治理技术研究[J]. 矿业安全与环保, 2020, 47(4): 82–87. DOI:10,19835/j. issn,1008–4495,2020.04.016.
YANG Junzhe, ZHENG Kaige, ZHAO Jizhan, et al. Research on fracturing treatment technology of concentrated stress disaster by the overlying coal pillar in close distance shallow seam. [J]. Mining Safety&Environmental Protection, 2020, 47(4): 82–87. DOI:10,19835/j. issn,1008–4495,2020.04.016.
|
| [7] |
杨俊哲,王振荣,吕情绪,等. 坚硬顶板超前区域治理技术在神东布尔台煤矿的应用[J]. 煤田地质与勘探,2022,50(2):17−23.
YANG Junzhe,WANG Zhenrong,LYU Qingxu,et al. Application of advanced regional treatment technology of hard roof in Buertai Coal Mine of Shendong Coal Group[J]. Coal Geology & Exploration,2022,50(2):17−23.
|
| [8] |
杜君武,黄庆享. 浅埋煤层群不同煤柱错距覆岩结构演化规律及煤柱稳定性分析[J]. 采矿与岩层控制工程学报,2022,4(1):16−24.
DU Junwu,HUANG Qingxiang. Overburden structure evolution and coal pillar stability analysis with different offset distance of coal pillars in shallow multi-seam[J]. Journal of Mining and Strata Control Engineering,2022,4(1):16−24.
|
| [9] |
吴文达. 浅埋煤层群上部遗留煤柱联动失稳压架机理与控制研究[D]. 徐州: 中国矿业大学, 2020.
WU Wenda. Study on mechanism and control of the support crushing disaster caused by interactive failure of upper residual pillars in shallow multiple coal seams[D]. Xuzhou: China University of Mining and Technology, 2020.
|
| [10] |
张 威. 上覆采空区遗留煤柱下孤岛工作面回采冲击矿压防治技术研究[D]. 徐州:中国矿业大学, 2021.
ZHANG Wei. Study on prevention and control technology of rock burst in isolated island working face under coal pillar left in overlying goaf [D]. Xuzhou: China University of Mining and Technology, 2021.
|
| [11] |
李春元,王泓博,石瑶玉. 上覆遗留区段煤柱对下伏煤层开采扰动影响研究[J]. 煤炭科学技术,2020,48(3):232−239. doi: 10.13199/j.cnki.cst.2020.03.029
LI Chunyuan,WANG Hongbo,SHI Yaoyu. Study on disturbing influence of overlying remaining coal pillars on under-lying coal seam mining[J]. Coal Science and Technology,2020,48(3):232−239. doi: 10.13199/j.cnki.cst.2020.03.029
|
| [12] |
黄庆享, 王林涛, 杜君武, 等. 浅埋极近距采空区下相向开采房柱采空区煤柱稳定性分析[J]. 采矿与安全工程学报, 2022, 39(1): 118–125.
HUANG Qingxiang, WANG Lintao, DU Junwu, et al. Stability of coal pillars in room-and-pillar goaf with opposite mining under ultra-close shallow goafs[J]. Journal of Mining & Safety Engineering, 2022, 39(1): 118–125.
|
| [13] |
黄庆享,贺雁鹏,罗利卜,等. 浅埋极近距离煤层采空区垮落顶板活化结构及支架阻力研究[J]. 采矿与安全工程学报,2018,35(3):561−566. doi: 10.13545/j.cnki.jmse.2018.03.016
HUANG Qingxiang,HE Yanpeng,LUO Libo,et al. Study on the active structure of caved roof and support resistance in shallow buried and ultra-close coal seams mining[J]. Journal of Mining & Safety Engineering,2018,35(3):561−566. doi: 10.13545/j.cnki.jmse.2018.03.016
|
| [14] |
姜鹏飞,康红普,张 剑,等. 近距煤层群开采在不同宽度煤柱中的传力机制[J]. 采矿与安全工程学报,2011,28(3):345−349. doi: 10.3969/j.issn.1673-3363.2011.03.003
JIANG Pengfei,KANG Hongpu,ZHANG Jian,et al. Mechanism of load-transfer between coal pillars with different widths in mining the short-range seams[J]. Journal of Mining & Safety Engineering,2011,28(3):345−349. doi: 10.3969/j.issn.1673-3363.2011.03.003
|
| [15] |
姜鹏飞,林 健,张 剑,等. 近距离煤层群开采在不同宽度煤柱中的能量分布[J]. 煤矿开采,2011,16(1):52−54. doi: 10.3969/j.issn.1006-6225.2011.01.017
JIANG Pengfei,LIN Jian,ZHANG Jian,et al. Energy distribution of coal pillars with different-width in mining close coal seams[J]. Coal Mining Technology,2011,16(1):52−54. doi: 10.3969/j.issn.1006-6225.2011.01.017
|
| [16] |
冯国瑞,白锦文,史旭东,等. 遗留煤柱群链式失稳的关键柱理论及其应用展望[J]. 煤炭学报,2021,46(1):164−179. doi: 10.13225/j.cnki.jccs.2020.0927
FENG Guorui,BAI Jinwen,SHI Xudong,et al. Key pillar theory in the chain failure of residual coal pillars and itsapplication prospect[J]. Journal of China Coal Society,2021,46(1):164−179. doi: 10.13225/j.cnki.jccs.2020.0927
|
| [17] |
贺顺泰. 葫芦素矿近距离上覆遗留煤柱下巷道位置分析及实践研究[D]. 徐州:中国矿业大学, 2021.
HE Shuntai. Position analysis and practice research of roadway closing to overlying residual coal pillar in hulusu mine [D]. Xuzhou: China University of Mining and Technology, 2021.
|
| [18] |
秦 凯,王健达,李宏艳,等. 集中煤柱诱发下伏近距离煤层异常矿压及机理研究[J]. 煤炭科学技术,2019,47(8):102−107. doi: 10.13199/j.cnki.cst.2019.08.012
QIN Kai,WANG Jianda,LI Hongyan,et al. Study on abnormal mine pressure and mechanism of near-distance coal seam induced by concentrated coal pillar[J]. Coal Science and Technology,2019,47(8):102−107. doi: 10.13199/j.cnki.cst.2019.08.012
|
| [19] |
徐敬民,朱卫兵,鞠金峰. 浅埋房采区下近距离煤层开采动载矿压机理[J]. 煤炭学报,2017,42(2):500−509. doi: 10.13225/j.cnki.jccs.2016.0811
XU Jingmin,ZHU Weibing,JU Jinfeng. Mechanism of dynamic mine pressure occurring below adjacent upper chamber mining goaf with shal-low cover depth[J]. Journal of China Coal Society,2017,42(2):500−509. doi: 10.13225/j.cnki.jccs.2016.0811
|
| [20] |
周海丰. 综采工作面过上覆集中煤柱压架机理分析[J]. 煤炭科学技术,2014,42(7):120−123,128. doi: 10.13199/j.cnki.cst.2014.07.030
ZHOU Haifeng. Analysis on hydraulic support crushed mechanism when fully-mechanized coal mining face passed through concentrated coal pillar area in above seam[J]. Coal Science and Technology,2014,42(7):120−123,128. doi: 10.13199/j.cnki.cst.2014.07.030
|
Supported by: Beijing Renhe Information Technology Co., Ltd. 
DownLoad: