采动影响下区段煤柱合理留设研究
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摘要
区段煤柱合理留设是保证工作面顺利接续的关键。以王楼煤矿七采区为工程背景,通过理论分析和数值模拟,对单、双侧开挖采动影响下不同宽度区段煤柱稳定性进行对比研究。得出:侧向支承压力在2种采动影响下随煤柱宽度不同其变化趋势基本一致,但双侧采动时侧向支承压力更大;2种采动影响下,煤柱应力集中程度基本一致,且随煤柱宽度的增加而增加,单侧采动时煤柱正上方覆岩基本完整,双侧采动时煤柱宽度大于3.0m其正上方覆岩才趋于完整;综合考虑资源回收和巷道稳定性,确定3.0m小煤柱可以满足工作面正常开采要求。
Reasonable setting-up of coal section pillars is the key to ensure smooth continuity of working face.Taking No.7 mining area in Wanglou coal mine as an engineering background,the stabilities of coal section pillars with different widths under the influence of excavation on one side or both sides were compared and studied through theoretical analysis and numerical simulation.It was concluded that the variation trend of lateral abutment pressure with the change of width of coal pillars was basically the same under the two mining effects,but the lateral abutment pressure was larger when mining on both sides.The stress concentration degree of coal pillars was basically the same under the two mining effects,and increased with the increase of the width of coal pillars.The overburden rock above the coal pillars was basically complete when mining on one side,but in case of mining on both sides,the overburden rock tended to be complete only when the width of coal pillars was larger than 3.0 m.Considering the resource recovery and roadway stability,it was determined that the small coal pillar with width of 3.0 mcould meet the normal mining requirements of the working face.
Reasonable setting-up of coal section pillars is the key to ensure smooth continuity of working face.Taking No.7 mining area in Wanglou coal mine as an engineering background,the stabilities of coal section pillars with different widths under the influence of excavation on one side or both sides were compared and studied through theoretical analysis and numerical simulation.It was concluded that the variation trend of lateral abutment pressure with the change of width of coal pillars was basically the same under the two mining effects,but the lateral abutment pressure was larger when mining on both sides.The stress concentration degree of coal pillars was basically the same under the two mining effects,and increased with the increase of the width of coal pillars.The overburden rock above the coal pillars was basically complete when mining on one side,but in case of mining on both sides,the overburden rock tended to be complete only when the width of coal pillars was larger than 3.0 m.Considering the resource recovery and roadway stability,it was determined that the small coal pillar with width of 3.0 mcould meet the normal mining requirements of the working face.
引文
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[4]秦忠诚,孙伟,陈光波,李谭,付彪.预采顶分层凹凸型煤体巷道布置优化研究[J].矿业研究与开发,2018,38(9):50-53.
[5]祁和刚,于健浩.深部高应力区段煤柱留设合理性及综合卸荷技术[J].煤炭学报,2018,43(12):3257-3264.
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[7]曹胜根,曹洋,姜海军.块段式开采区段煤柱突变失稳机理研究[J].采矿与安全工程学报,2014,31(6):907-913.
[8]孔德中,王兆会,李小萌,等.大采高综放面区段煤柱合理留设研究[J].岩土力学,2014,35(S2):460-466.
[9]张后全,石浩,李明,等.基于锚杆轴力实测的综采工作面区段煤柱稳定性分析[J].煤炭学报,2017,42(2):429-435.
[10]张广超,何富连,来永辉,等.高强度开采综放工作面区段煤柱合理宽度与控制技术[J].2016,41(9):2188-2194.
[11]白庆升,屠世浩,袁永,等.基于采空区压实理论的采动响应反演[J].中国矿业大学学报,2013(3):355-361,369.
[12]王猛,李文峰.基于Salamon模型的采空区冒落矸石加载机理分析[J].中国煤炭,2015,41(2):50-54.