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| Optimization research on coal pillar width of secondary dynamic pressure roadway |
| Pang Jiewen， Li Pengwei， Xie Jianlin， Liang Lei， Hao Yongjiang |
| School of Environment and Safety， Taiyuan University of Science and Technology， Taiyuan 030024， China |
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Abstract In order to ensure the stability of the surrounding rock of the roadway affected by the secondary dynamic pressure, the reasonable value range of the coal pillar width was calculated by using the limit equilibrium theory of rock mass. At the same time, the FLAC3D software was used to simulate the vertical stress distribution when the roadway was 40 m ahead of this and adjacent working face, and effected by twice dynamic pressure with coal pillar widths of 6 m, 8 m, 10 m, 12m and 15m respectively. The combined support of strong bolts and cables was proposed for field application and the displacement of the surrounding rock surface was monitored. The results showed that: ① When the safety factor was 0.15 ~ 0.35, the width of the coal pillar in the study roadway should be 7.57 m ~ 8.89 m;②Compared with the numerical simulation results, it was found that when the width of the coal pillar was 8 m, the coal pillar could not only play its load-bearing role, but also ensured the smallest stress concentration area of the coal pillar and the least waste of coal resources;③Affected by the primary dynamic pressure, when the adjacent working face exceeded 110 m, the surrounding rock deformation tended to be stable, and the deformation of the roadway was within a safe range, which could still serve the mining of this working face.
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| [ 1 ] 寇海萍. 小煤柱开采合理宽度的最优设计[ J ]. 山西化工，
2021，193（ 3 ）：108 - 109.
[ 2 ] 柏建彪. 沿空掘巷围岩控制[ M ]. 徐州：中国矿业大学出版社，2006.
[ 3 ] 任传鹏，丁日佳，李 上. 我国煤炭采出率标准研究[ J ]. 煤矿开采，2010，15（ 3 ）：111 - 114.
[ 4 ] 凌春霞，刘金国. 影响煤炭开采采出率的因素及提高回收率 的措施浅析[ J ]. 矿山测量，2015（ 6 ）：38 - 40.
[ 5 ] 王俊峰. 中厚煤层留窄煤柱沿空掘巷支护技术研究[ J ]. 煤炭科学技术，2020，48（ 5 ）：50 - 56.
[ 6 ] 赵 宾，王方田，梁宁宁，等. 高应力综放面区段煤柱合理宽度与控制技术[ J ]. 采矿与安全工程学报，2018，35（ 1 ）：19 - 26.
[ 7 ] 石 崇，杨文坤，沈俊良，等. 动压巷道区段煤柱合理留设宽度研究[ J ]. 煤炭科学技术，2019，47（ 7 ）：108 - 114.
[ 8 ] 李 斌，李 刚，汪北方. 南阳坡煤矿8800综放工作面临空小煤柱尺寸研究[ J ]. 煤炭工程，2020，52（ 7 ）：63 - 67.
[ 9 ] 侯朝炯，马念杰. 煤层巷道两帮煤体应力和极限平衡区的探讨[ J ]. 煤炭学报，1989（ 4 ）：21 - 29.
[ 10 ] 钱鸣高，石平武，许家林. 矿山压力与岩层控制制[ M ]. 徐州：中国矿业大学出版社，2010.
[ 11 ] 朱永建. 煤巷顶板稳定性分类方法及其应用[ M ]. 天津：天津大学出版社，2014. |
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