基于定量地震学的矿山微震活动对开采速率的响应特性研究

RESEARCH ON RESPONSE OF MINE MICROSEISMICITY TO MINING RATE BASED ON QUANTITATIVE SEISMOLOGY

矿山地震活动是矿山开采的岩体动力响应,反映矿山岩体应力、变形和破坏状态。利用冬瓜山铜矿微震监测数据,基于定量地震学原理,采用累积视体积ΣVA、能量指数EI和累积开挖量ΣVm时程曲线分析方法,研究矿山开采速率与微震变形之间的关系;并从能量的储存与释放的角度,结合视体积VA和弹性收敛体积VE,提出将累积地震视体积ΣVA与累积开采量ΣVm之比作为微震活动对开采速率的响应系数(CSR),以表征岩体中能量的储存与释放关系。研究结果表明,矿山开采量对ΣVA和EI时程曲线特性有明显的影响,矿山开采速率与微震应变率存在对应关系,CSR的变化反映了系统的稳定变化趋势,可以方便地应用于矿山活动的监测分析和作为矿山生产速率控制的指导参数。

Seismicity in mines is dynamic response of rock mass to mining and reflects the stress state, deformation and destruction of rock mass. Using the time history methods of the cumulative apparent volume ∑VA, energy index EI and cumulative volume ＆production ∑Vm, the relationship between seismic deformation and mining rate is studied in the framework of quantitative seismology with the seismic data monitored in Donguashan Copper Mine. According to the view of storage and release of energy, combining with seismic apparent volume VA and elastic convergence volume VE, the ratio of the cumulative apparent volume ∑VA to the cumulative volume of production ZVm is defined as coefficient of seismic response to mining（CSR） to present the relationship between energy storage and energy release in rock mass. The results show that, the volume of production influences obviously on time history curves of ∑VA and EI; there is a correlation between mining rate and seismic strain rate; the variation of CSR indicates the tendency of stability of rock mass system, which can be easily used in analysis of mine seismicity monitoring and as a good guide parameter to control mining rate.