采空区突水动力灾害的微震监测案例研究

为提高采空区突水监测及控制效果,理论分析了采空区突水的微震现象,提出了微震能量释放率、能量密度的概念和计算方法,对微震活动性进行了时间、空间上的参数表达;提出了采空区突水分区分时微震监测法,指出对不同时期、不同危险区域采取针对性监测分析方法和危险控制手段以避免采空区突水事故的发生.采空区突水微震监测案例分析表明:采空区突水灾害有微震活动前兆信息,微震活动性与突水危险存在内在联系;突水发生前微震能量、频次、能量释放率均有增强的趋势,采用能量释放率可实时分析判定突水危险区微震活动强度的发展变化,采用能量密度可对突水危险区各区域微震活动强弱进行量化分析比较.

A case study of micro-seismic monitoring. goal water-inrush dynamic hazards

Mining safety can be improved by more effective monitoring for water inrush in the goaf.To this end,the relative effect of monitoring micro-seismic events has been analyzed.A theory of energy emission rate and energy spatial density is proposed to compensate for a deficiency of micro-seismic activities in both time and space.A monitoring method using partitioning and time sharing is proposed,which indicates reasonable monitoring and prevention measures are needed to cope with water inrush hazards and these should be based upon different periods of time and different zones in the goaf.A case study showed that warning of a pending water inrush event exists in the micro-seismic data.The total energy,the number of events,and the energy emission rate all increase before the water inrush event.The energy emission rate of micro-seismic events can be used to analyze the micro-seismic activity in time and the energy spatial density in space.