工作面推进速度对微震事件的影响分析  

Analysis of the influence of working face advancing speed on microseismic events

作　　者：邓天 田晓兵 张怀忠 董哲 DENG Tian;TIAN Xiaobing;ZHANG Huaizhong;DONG Zhe(Shaanxi Binchang Hujiahe Mining Co. ,Ltd. ,Xianyang 713600,China)

机构地区：[1]陕西彬长胡家河矿业有限公司,陕西咸阳713600

出　　处：《陕西煤炭》2022年第4期147-151,共5页Shaanxi Coal

摘　　要：为探究工作面推进速度对微震事件的影响,以胡家河煤矿401111回采工作面为研究背景,通过对回采工作面推进全过程中不同时期推进速度对微震事件发生频率和强度的影响进行分析,确定了不同冲击危险区域内合理的推进速度。在明确该回采工作面的冲击危险性因素分别为强冲击倾向性煤层、高应力分布、上覆坚硬顶板的基础上,发现回采速度的突然降低或者升高均会导致微震事件出现异常。回采期间微震能量和回采速度同时增加的情况下,冲击地压发生的危险性将会上升;在中等冲击危险区域内,日进尺应保持在不大于5.6 m/d,在强冲击危险区域内,日进尺应保持在不大于4.0 m/d;在特殊开采阶段或者穿越地质构造区需要合理优化回采速度来保障生产安全。In order to explore the influence of working face advancing speed on microseismic events,taking 401111 working face of Hujiahe Coal Mine as the research background,through the analysis of the influence of the advancing speed of the working face in different periods on the frequency and intensity of the microseismic events in the whole process of the advancing of the working face,and the reasonable advancing speed in different burst risk areas was determined.Based on the fact that the burst risk factors of the mining face are respectively strong burst prone coal seam,high stress distribution,and overlying hard roof,it is found that the sudden decrease or increase of the mining speed will lead to abnormal microseismic events.When the microseismic energy and the mining speed increase at the same time during the mining period,the risk of rock burst will increase;in the medium burst risk area,the daily footage should be kept at no more than 5.6 m/d,and in the strong burst risk area,the daily footage should be kept at not more than 4.0 m/d;in special mining stages or through geological structural areas,it is necessary to reasonably optimize the recovery speed to ensure production safety.

关 键 词：冲击地压 回采速度 微震事件 冲击危险性 高应力分布 

分 类 号：TD324[矿业工程—矿井建设]