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根据会泽铅锌矿复杂地质状况,建立了一套24通道全数字微震监测系统,对深部岩体开采诱发微震事件进行监测,得到岩体随开采过程诱发微震事件的参数,包括b值、震级和事件数等.推导出b值与容量维Df之间的关系式为Df=2b,分析了容量维Df随时间变化和采场垮冒的关系.分析结果显示:岩体失稳破坏和Df值变化密切相关.随着开采扰动变化,由应力集中引起局部岩体裂纹压密、萌生和扩展,Df表现为增加后保持相对平静的现象,表明岩体裂纹的粗糙度在增加;一旦岩体破坏引发动力灾害,Df值急剧下降,表明岩体裂纹的粗糙度在降低,岩体破坏加速;结合现场实践,分析得出Df值越小,发生岩体破坏的概率越大.
According to the complex geological conditions in Huize lead-zinc mine, a 24-channel all-digital microseismic monitoring system was established to monitor microseismic events induced by deep rock mass mining. Parameters of microseismic events induced by the mining process were obtained, including b values, magnitude And the number of events, etc. The relationship between the b value and the capacity dimension Df is deduced as Df = 2b, and the relationship between the capacity dimension Df and the stope collapse is analyzed.The analysis results show that the failure of rock mass and Df With the variation of mining disturbance, the crack concentration, initiation and expansion of local rock mass are caused by the stress concentration, and Df shows the phenomenon of relatively calm after the increase, indicating that the roughness of the rock mass is increasing; once the rock mass The Df value dropped sharply after destroying the dynamic disaster, which indicates that the roughness of the rock mass is decreasing and the failure of the rock mass is accelerated. Combining with the field practice, the smaller the Df value, the greater the probability of rock mass destruction.