千米埋深工作面煤层合并区应力演化与防冲技术  

Stress evolution and rockburst control technology in coal seam composite zone of kilometer working face

作　　者：李剑锋[1] 罗武贤 李兵 朱金标 朱彦飞 贺虎[3] LI Jianfeng;LUO Wuxian;LI Bing;ZHU Jinbiao;ZHU Yanfei;HE Hu(Xuzhou Coal Mine Group,Xuzhou 221018,China;Zhangshuanglou Coal Mine,Jiangsu Xukuang Energy Co.,Ltd.,Xuzhou 221616,China;School of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]徐州矿务集团有限公司,江苏徐州221018 [2]江苏徐矿能源股份有限公司张双楼煤矿,江苏徐州221616 [3]中国矿业大学资源与地球科学学院,江苏徐州221116

出　　处：《煤炭科学技术》2021年第10期44-49,共6页Coal Science and Technology

基　　金：国家自然科学基金资助项目(51974302,51634001);国家重点研发计划资助项目(2016YFC0801403)。

摘　　要：煤层合并与分叉是诱发冲击地压的重要因素,合理确定煤层合并区应力分布规律与影响范围对冲击地压防治意义重大。以张双楼煤矿千米埋深煤层合并区工作面为工程背景,采用数值模拟与现场微震监测,研究了煤层合并区域采动应力演化规律与冲击危险监测预警方法。结果表明:煤层合并区超前影响范围约为100 m,而滞后影响范围约为80 m;工作面在煤层合并区回采时的峰值应力大于正常煤层,且合并区煤厚越厚,峰值应力越大。工作面接近合并区时应力梯度最大,冲击危险程度最高;进入合并区后随着底煤厚度变大,应力缓慢上升,应力变化梯度小,整体冲击危险程度较高,但冲击危险性变化不大;出合并区后一定范围内应力集中程度依然较高,具有明显的滞后性。基于微震监测系统,提出了采用冲击变形能作为煤层合并区冲击危险的预警指标,确定了预警临界值,进出合并区的监测预警结果与数值模拟以及现场矿压显现具有较强的一致性。针对合并区底煤范围大的特点,提出了合并区超深穿层底煤卸压-注水与顺层钻孔卸压相结合的防冲技术方案,实现了工作面底煤的全覆盖卸压处理,取得了显著的防冲效果,保证了工作面的安全高效回采。The composite and bifurcation of coal seam are significant factors inducing rockburst and the stress distribution as well as the in⁃fluence area is the key to the design reasonable prevention and control technologies.Taken a kilometer longwall mining in Zhangshuanglou Coal Mine as the engineering background,this paper studied the stress evolution laws and rockburst monitoring methods by numerical simu⁃lation and field microseismic system.The results show that the composite zone has an influence range of 100 m ahead the working face and the lagging area of 80 m.The peak stress is greater than that in the normal areas,the thicker the coal seam the greater the peak stress.When the working face is close to the composite zone,the stress gradient is the largest and the rockburst risk is the greatest.After entering,the stress increases slowly with the coal thickness,but the stress gradient is small,so the risk degree maintains stable as though the rock⁃burst risk still high.After leaving the composite zone,the stress concentration is still high with obvious hysteresis.The strain energy index is proposed based on microseismic system which shows a strong consistency with the numerical simulation and the on-site underground pressure observing.Aiming to the large range of the bottom coal in the composite area,the super-deep inclined seam destress-water injec⁃tion combined hole and parallel seam large-diameter-drilling are implemented in the composite area which realizes the full coverage stress relief of the coal,and takes a significant rockburst prevention effect to ensure the safety and efficient recovery of the working face.

关 键 词：冲击地压 煤层合并区 应力演化 千米埋深工作面 防冲技术 

分 类 号：TD324[矿业工程—矿井建设]