关键词: 地下金属矿山, 微震监测, 岩体稳定性, 开采扰动

Abstract: In order to explore the microseismic monitoring technology and stope stability analysis of underground metal mines，12 high-precision microseismic monitoring devices are designed and arranged in the middle section of the first mining，taking the soft-breaking and difficult-to-break mining body of Zhong⁃ guan Iron Mine as the research object. Among them，a total of 5 microseismic detectors are set at-170 m lev⁃ el，and the spacing of measuring points is about 170 m. A total of 7 micro seismic detectors are set at the lev⁃ el of -230 m，and the distance between measuring points is about 150 m，which can realize the full cover⁃ age of micro-seismic monitoring signals in the northern stope. The microseismic monitoring data are compre⁃ hensively analyzed from the aspects of the number of microseismic cumulative events and activity time histo⁃ ry，three-dimensional stability of rock mass，and stability of roof and floor of mine. The characteristics of microseismic activity and ground pressure activity are clarified，and the characteristics of precursor informa⁃ tion are analyzed and obtained. The results show that the microseismic activity of Zhongguan Iron Mine is mainly divided into two quiet periods and one active period. In the frequent stage of blasting and mining ac⁃ tivities，the rock mass is affected by excavation and blasting disturbance，and the internal micro-cracks ini⁃ tiate and expand. After the end of the concentrated ore falling，the microseismic activity still maintains a high level and has a gradual weakening trend. The curve trend shows relatively regular ups and downs. Dur⁃ ing the monitoring period，the overall rock mass stability is relatively stable，and large-scale rock mass in⁃ stability will not occur. The research results can provide a theoretical basis for safe and efficient operation of mines.

Key words: underground metal mines, microseismic monitoring, rock mass stability, mining distur? bance