摘要
为揭示煤柱群下厚硬顶板浅埋工作面开采覆岩运动特征,以高庄煤矿3下303工作面(对应3上煤层为煤柱群支撑顶板的房式采空区)为背景,采用理论分析、数值模拟方法,结合现场监测数据研究了煤柱群下厚硬顶板浅埋工作面覆岩运动特征。研究结果表明,3下号煤层开采过程中受3上号煤层煤柱和矿房影响,煤柱下开采受近距离顶板岩层剪切应力集中影响容易发生帮角顶板破坏,矿房下开采煤柱帮部及其顶、底板岩层剪切应力集中而发生破坏;覆岩运动过程分为厚硬顶板之下岩层破坏、厚硬顶板破坏、基岩整体切落3个阶段,第三阶段覆岩结构不能形成稳定承压拱进而造成矿压显现明显;工作面开采期间微震事件能量整体较小,但事件分布随着厚硬顶板破坏向更高岩层扩展,微震频次、能量均呈增长趋势。煤柱群下厚硬顶板浅埋工作面开采液压支架选型应考虑覆岩整体切落带来矿压升高的风险。
To reveal the overburden movement characteristics of shallow-buried workface mining under thick hard roof in coal pillar clusters,this study takes 303 working face of the 3-lower coal seam of Gaozhuang Coal Mine as the engineering background(corresponding to the room-and-pillar goaf in the 3-upper coal seam supported by coal pillar clusters).Through theoretical analysis,numerical simulation methods,and field monitoring data,the overburden movement features of the shallow-buried workface with thick hard roof under coal pillar clusters were systematically investigated.The results indicated that during the mining of the 3-lower coal seam,influenced by coal pillars and mine rooms in the overlying 3-upper coal seam,shear stress concentration in the immediate roof strata beneath coal pillars led to rib-corner roof failure,while localized damage occurred at coal pillar ribs and surrounding roof/floor strata under mine rooms.The overburden movement process was characterized by three distinct stages:initial failure of strata beneath the thick hard roof,subsequent fracturing of the thick hard roof itself,and ultimately the integral shear collapse of bedrock strata.During the third stage,the overlying strata structure failed to form a stable pressure-bearing arch,leading to the evident manifestation of mine pressure.During face mining,the overall energy of micro-seismic events was small.However,the frequency and energy of these events increased as the damage to the thick hard roof extended to higher rock layers.When selecting hydraulic supports for shallow-buried workface mining with thick hard roof under coal pillar clusters,the risk of elevated ground pressure caused by integral shear collapse of overburden strata must be prioritized in design considerations.
作者
白秉哲
刘国磊
梁文昭
郝喜庆
胡海滨
田利华
吴延成
BAI Bingzhe;LIU Guolei;LIANG Wenzhao;HAO Xiqing;HU Haibin;TIAN Lihua;WU Yancheng(School of Resources and Environmental Engineering,Shandong University of Technology,Zibo,Shandong 255022,China;State Key Laboratory for Tunnel Engineering,China University of Mining and Technology-Beijing,Haidian,Beijing 100083,China;Zaozhuang Mining Group Gaozhuang Coal Industry Co.,Ltd.,Jining,Shandong 277605,China;Guotun Coal Mine,Shandong Energy Linyi Mining Group Heze Coal Power Co.,Ltd.,Heze,Shandong 271004,China)
出处
《中国煤炭》
北大核心
2025年第5期39-49,共11页
China Coal
基金
国家自然科学基金资助项目(51904178)
中国博士后科学基金面上项目(2018M632677)
国家自然科学基金面上项目(52474104)。
关键词
煤柱群
浅埋工作面
厚硬顶板
覆岩运动
coal pillar clusters
shallow-buried workface
thick hard roof
overburden movement
