Study on microseismic activity law of large buried depth working face
In order to avoid the occurrence of mine water outburst and realize the safe mining of working face,this paper took No.12210 Face of Xingdong Mine of Jizhong Energy Co.,Ltd.as the research object.Through the establishment of microseismic monitoring system in the working face,No.12210 Face was monitored in real time,dynamically and continuously by using high-precision microseismic monitoring technology.The results showed that the microseismic events were mainly concentrated in the working face and near the faults around the working face.The roof microseismic events were mainly concentrated in the range of 0～39.50 m,and the floor microseismic events were mainly concentrated in the range of 31 m below the coal seam.When passing through the fault exploration roadway,the microseismic activity response was obvious;the mining disturbance under the influence of fault had a significant influence on the maximum depth of floor disturbance.The mining speed was significantly positively correlated with the total number of microseismic events,the number of roof events,and the number of floor events.And the mining speed was significantly negatively correlated with the maximum floor disturbance depth.The correlation coefficients were 0.568,0.547,0.568,and-0.376,respectively.
water outburstmicroseismic monitoringfaultmining speed
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