基于微震监测的近距离煤层重复采动覆岩裂隙发育特征研究  

Study on Development Characteristics of Overburden Fractures under Repeated Mining in Short Distance Coal Seam Based on Microseismic Monitoring

作　　者：刘文静[1,2] 岳东 霍小泉 范智海 王新堂 赵玉桃 杨琛 贺斌雷 李刚 蒋上荣 LIU Wenjing;YUE Dong;HUO Xiaoquan;FAN Zhihai;WANG Xintang;ZHAO Yutao;YANG Chen;HE Binlei;LI Gang;JIANG Shangrong(Xi′an University of Science and Technology,Xi′an 710054,China;Shaanxi Coal and Chemical Technology Institute Co.,Ltd.,Xi′an 710000,China;Shaanxi Coal Tongchuan Mining Co.,Ltd.,Tongchuan 727000,China;Xiashijie Coal Mine,Shaanxi Coal Tongchuan Mining Co.,Ltd.,Tongchuan 727000,China)

机构地区：[1]西安科技大学,西安710054 [2]陕西煤业化工技术研究院有限责任公司,西安710000 [3]陕西陕煤铜川矿业有限公司,陕西铜川727000 [4]陕煤铜川矿业有限公司下石节煤矿,陕西铜川727000

出　　处：《煤炭技术》2022年第9期23-28,共6页Coal Technology

基　　金：国家自然科学基金面上项目(51774234,51874234,51737007)。

摘　　要：针对下石节煤矿近距离煤层重复采动的工程实际,采用微震监测、数字钻孔窥视、理论计算的方法,对重复采动作用下的覆岩裂隙发育规律进行研究。研究结果表明:随222工作面的推进,夹层经历失稳、破断、垮落的过程,其破裂位置为距切眼14.3 m与53.2 m,且主要以拉伸破裂为主。由微震监测可得,222工作面上覆岩层大于1000 J的大能量微震事件分布于60.8 m垮落带范围内,100~1000 J微震事件分布于128.3~158.9 m的裂隙带范围内。研究结果揭示了重复采动条件下覆岩裂隙演化特征,根据其演化机理提出采空区卸压瓦斯治理工程对策,可为类似矿井的瓦斯防治工作提供借鉴。According to the engineering practice of repeated mining in Xiashijie coal mime short distance coal seam,the development law of overburden fractures under the action of repeated mining is studied by using the methods of microseismic monitoring,digital borehole peeping and theoretical calculation.The results show that with the advance of working face 222,the interlayer experiences the process of instability,fracture and collapse.The fracture positions are 14.3 m and 53.2 m away from the cutting hole,and the main fracture is tensile fracture.According to the microseismic monitoring,the high-energy microseismic events greater than 1000 J in the overburden of working face 222 are distributed in the 60.8 m collapse zone,and 100-1000 J microseismic events are distributed in the 128.3-158.9 m fracture zone.The research results reveal the evolution characteristics of overburden fractures under the condition of repeated mining,and put forward the engineering countermeasures for pressure relief gas control in the goaf according to its evolution mechanism,it can provide reference for gas prevention and control in similar mines.

关 键 词：微震监测 覆岩裂隙演化 重复采动 钻孔窥视 

分 类 号：TD821[矿业工程—煤矿开采]