天然地震对桦树沟铜矿地压活动的影响规律研究

Study on the Influence of Natural Earthquake on Ground Pressure Activity in Huashugou Copper Mine

桦树沟铜矿位于祁连山地震带上,天然地震对于矿区安全生产具有一定影响。对矿区微震事件的“时、空、强”三要素进行统计分析,通过地震前后矿区微震活动βn值、η值、能量指数与累计视体积等参数的变化情况反映矿区地压活动规律。研究结果表明,天然地震发生当天矿区没有明显的地压活动,大的地震发生2~3 d后井下会发生明显的地压活动;天然地震对矿区地压活动的影响具有一定的滞后性,并具有次生灾害的特点。

Huashugou Copper Mine is located in the Qilian Mountain seismic belt,and the natural earthquake has a certain influence on the safety production of the mining area.The three elements of’time,space and strength’of microseismic events in the mining area are statistically analyzed.The variation of parameters such asβn value,ηvalue,energy index and cumulative apparent volume of microseismic activity in the mining area before and after the earthquake reflects the law of ground pressure activity in the mining area.The results show that there is no obvious ground pressure activity in the mining area on the day of the natural earthquake,and there will be obvious ground pressure activity in the underground after2~3 days of the large earthquake.The influence of natural earthquake on ground pressure activity in mining area has a certain lag,and has the characteristics of secondary disasters.