A study on microseismic monitoring of rock burst in coal mine
煤矿冲击地压的微地震监测研究

By using the underground microseismic monitoring(MS) system in Huafeng Coal Mine of China,we have studied the relationship between strata fracturing and rock burst in underground coal mine,and discussed the possibility of forecasting rock burst based on the rules of strata fracturing monitored by MS.This paper presents the dynamical processes of strata fracturing and mining stress arround the longwall face while mining No.4 seam(strong burst seam) and No.6 seam(under No.4 seam for unloading).The result shows that the high stress zone is close to the fractured zone.When the maingate of No.4 seam is in the fractured roof zone of No.6 seam,rock burst never happens during developing maingate and mining of No.4 seam.If the maingate of No.4 seam is out of the fractured roof zone of No.6 seam,rock burst would happen during developing and mining of No.4 seam.The beginning reaction distances of faults in front of the longwall face are 250 m and 350 m,respectively of No.6 and No.4 seam.Based on the distances,it is possible to unload in the fault zone to prevent rock burst.MS monitoring results also show the 3-D shape and scale of strata fracturing,which are very useful to determine the height of water-proof in coal mine.The MS monitoring results have proved that heavy massive strata fracturing and fault reaction are the main reasons of rock burst in the Huafeng Coal Mine.The good location results show that the MS monitoring system and locating software can be used in coal mines and tunnels for monitoring rock mass fracturing.