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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 spatiotemporal distribution of microseismic activity in a mine was analyzed by using the shortest distance clustering method, and the underground pressure-activated zone was identified effectively by combining with the on-site excavation plan.Through establishing the time series curve of microseismic parameters in each activity zone, The results show that the microseismic aggregates in the mine are isolated from each other during the study period, and the excavation activities do not cause a wide range of ground pressure activities. The cumulative events and accumulated time series of microseismic events The sudden release of cumulative strain energy in the rock mass is characterized by sudden increase of calmness, which indicates the deterioration of the stability of the surrounding rock.Based on the research results, a general model of the stability of downhole rock mass based on microseismic monitoring technology is finally established.