矿山微地震活动时空分布

Space-time distribution of microseismic activities in mines

利用最短距离聚类法对某矿山微地震活动的时空分布进行了分析,结合现场采掘计划,有效识别了井下地压活动区.通过建立各活动区内微震参数时间序列曲线,研究了局部围岩的应力变形规律,探讨了岩体失稳的前兆规律.结果表明:研究期间井下各微震聚集区相互孤立,采掘活动不会引起大范围的地压活动;微震累计事件数及累计能量时间序列曲线出现由平静突然增大时表征了岩体内累积应变能的突然释放,预示围岩稳定性的劣化.根据研究结果,最终建立了基于微震监测技术井下岩体稳定性研究的一般模式.

The space-time distribution of microseismic activities in a mine was analyzed by minimum distance clustering. Combined with mining activities, areas with ground pressure activities were identified effectively. The time series curves of microseismic parameters were established to study the stress and deformation of local surrounding rock and investigate the precursor of rock mass fail- ure. It is found that accumulation areas are isolated and unaffected each others, showing that large-area ground pressure activities will not happen. An abrupt increase of accumulated events number and energy after quiet in the time series curves represents the sudden release of accumulation energy in rock mass, indicating that the stability of surrounding rock deteriorates. Based on the research results and microseismic monitoring technology, a general model was established to study the stability of surrounding rock.