Abstract：As the coal mining goes deeper，strong mining induced earthquakes occur frequently，which seriously threaten the safety of underground miners and ground residents，as well as the productivity and effectiveness of mining activities. The key stratum theory and micro-seismic monitoring technology are used to analyze the distribution and evolution law of strong mine earthquakes during the mining of deep coal seams in Dongtan coal mine. The coordinated fracture characteristics of multiple key strata during the coal mining process is investigated. The results show that the mining induced earthquakes are mostly concentrated in the near-field overlying rock strata in the initial stage of coal mining. As the working face advances，the mine earthquakes gradually transfer into the far-field thick and hard rock strata. The far-field thick and hard overlying strata is the main breeding and occurrence place of strong mine earthquakes. The overlying rocks above a deep coal seam often contain multiple key strata. The cooperative fracture movement of overlying key strata may be induced by the coal seam mining activities. When the key strata is broken instantly，the accumulated elastic strain could be released suddenly，which is the main reason for the occurrence of mining induced earthquakes. The fracture in the key strata above the goaf is generally presented in the form of “O-X”. The range of “O-X” type fracture increases gradually from deep to shallow. The characteristics and classification of fracture structures are also investigated. The research results are of great significance to the safe and efficient mining of deep coal mines under similar conditions.
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2023, Vol. 42 
