巨野矿区厚表土薄基岩综放工作面微震响应特征  

Microseismic response characteristics of fully mechanized caving face under thick topsoil and thin bedrock in Juye mining area

作　　者：殷海晨 刘国磊[2,3] 曹安业 王泽东[2] YIN Hai-chen;LIU Guo-lei;CAO An-ye;WANG Ze-dong(Research Center of Rock Burst Prevention and Control,Shandong Energy Group Co.,Ltd.,Jinan 100013,China;Shandong University of Technology,Zibo 255000,China;Geotechnical and Structural Engineering Research Center,Shandong University,Jinan 250061,China;School of Mines,China University of Mining Technology,Xuzhou 221008,China)

机构地区：[1]山东能源集团有限公司冲击地压防治研究中心,山东济南250014 [2]山东理工大学,山东淄博255000 [3]山东大学岩土与结构工程研究中心,山东济南250061 [4]中国矿业大学矿业工程学院,江苏徐州221116

出　　处：《煤炭工程》2022年第8期61-66,共6页Coal Engineering

基　　金：国家自然科学基金青年项目(51904178);山东省自然科学基金博士基金项目(ZR2018BEE009)。

摘　　要：针对巨野矿区深厚表土条件下综放工作面基本顶破断产生强动载,诱发强烈矿压显现的问题,采用理论分析、现场试验等方法对单侧采空工作面和大煤柱跳采工作面的微震响应规律进行研究,为强动载与高静载耦合叠加型冲击地压的防治工作提供技术依据和经验借鉴。研究结果表明:巨厚松散层在煤层开采后垮落、沉降明显,细砂岩基本顶是动静载叠加冲击风险影响较大的主关键层;工作面超前支承应力峰值区域的采空侧巷道、采空区走向边界、地质构造区域是强微震事件高发区域;留230m煤柱跳采的工作面微震事件数量和能量在倾向上呈偏向采空区一侧分布的双峰型,大尺寸煤柱不能完全阻隔采空区应力传递影响;工作面应保持低强度匀速推采,避免引起基本顶的大规模能量积聚和突发性释放,同时分析微震频次和能级降低情况能预测基本顶后续大规模破断的时机,提前采取专项防冲措施。In fully mechanized caving face under deep thick topsoil in Juye mining area,strong dynamic load is caused by the basic roof breaking,leading to strong mining pressure behavior.Theoretical analysis and field test methods are used to study the microseismic response law of the single-side goaf working face and the large coal pillar skip mining working face,so as to provide technical basis and experience for the prevention and control of rock burst with strong dynamic load and high static load coupling superposition.The results show that:Firstly,the extra-thick loose layer collapses and settles obviously after coal mining;the basic roof of fine sandstone is the main contributor to the microseismic event of the working face,and the main key layer with large rockburst risk of dynamic and static load superposition.Secondly,strong microseismic events occur frequently in the gob-side roadway,strike boundary of goaf and geological structure area in the peak area of advance abutment stress of working face.Thirdly,the number and energy of microseismic events in the working face with 230 m coal pillar skip mining distribute bimodally along the dip and nearer the goaf,and the large coal pillar cannot completely block the stress transfer in the goaf.Fourthly,the working face should keep low strength and uniform mining to avoid large-scale energy accumulation and sudden release in the basic roof;meanwhile,timing of the next large-scale breaking of the basic roof can be predicted by analyzing the microseismic frequency and energy level reduction,so that targeted rockburst prevention measures can be taken in advance.

关 键 词：厚表土层 薄基岩 关键层 微震监测 综放开采 

分 类 号：TD324[矿业工程—矿井建设]