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为使东升庙铅锌矿采空区微震监测系统更好服务于矿山,运用FLAC~(3D)模拟开挖900~1000m和850~900 m中段矿体(除8~#矿柱)。根据模拟结果,确定重点监测区域为900 m中段以上8~#间柱附近的上盘围岩、900 m中段以上11#采空区上盘围岩和980 m中段以上2#采空区上盘围岩。基于应力分析结果,合理构建19通道微震监测系统,对采空区上盘围岩实施全天候监测。通过微震活动日分布图可知微震活动性与矿山生产活动具有一定相关性。对10月23日—11月6日期间内立方体岩体的能量释放率和分形维数随时间变化的规律进行研究。结果表明:分形维数可以预示大微震事件的发生;分形维数快速下降现象可以作为预警特征,提高微震监测系统对采空区上盘围岩监测预警的准确性。
In order to make the microseismic monitoring system of the Dongshengmiao lead-zinc mine goaf better serve the mine, the mid-section ore bodies of 900-1000m and 850-900m were excavated by using FLAC 3D simulation except for the 8th-# pillar. According to the simulation results, it is determined that the key monitoring area is the hanging wall rock near the middle of section 8 ~ # of 900 m, the hanging wall rock of 11 # goaf above 900 m and the hanging wall of 2 # gashing section above 980 m Surrounding rock. Based on the stress analysis results, a reasonable 19-channel microseismic monitoring system is constructed to monitor the surrounding rock of goaf in the goaf all-weather. The microseismic activity distribution map shows that microseismic activity has some correlation with mine production activities. The energy release rate and fractal dimension of cubic rock mass with time from October 23 to November 6 were studied. The results show that the fractal dimension can predict the occurrence of large microseismic events. The rapid decline of fractal dimension can be used as an early warning feature to improve the accuracy of microseismic monitoring system monitoring and warning of the surrounding rock of the hanging wall in the goaf.