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针对矿山岩体强度参数具有随空间和时间动态变化的特点,以石人沟铁矿为例,对地下岩体破坏过程中产生的微震信号进行处理、分析,获得微震监测数据的3个参数(事件数量、能量、事件间距离),结合应力场数值计算结果,分析地下岩体失稳破坏过程的微震数据和应力场演化规律,得到微震数据变量和应力变量之间的对应关系。然后对岩体强度参数进行综合反演,提出基于微震数据和应力场数据的岩体强度参数动态标定方法,并获得地下围岩稳定性的安全储备系数。研究结果表明:微震监测数据结合应力场分析能很好地实现矿山岩体强度参数动态标定,为矿山岩体稳定性动态评价提供有效的量化分析手段。
According to the characteristics of the rock mass strength changing dynamically with time and space, taking the Shirengou iron mine as an example, the microseismic signals generated during the process of underground rock mass destruction are processed and analyzed to obtain three parameters of the microseismic monitoring data The number of events, the energy and the distance between events), the microseismic data and the evolution of stress field in the process of instability and failure of underground rock mass are analyzed in combination with the numerical results of stress field, and the corresponding relationship between microseismic data variables and stress variables is obtained. Then, the rock mass strength parameters are comprehensively retrieved. The dynamic calibration method of rock mass strength parameters based on microseismic data and stress field data is proposed, and the safety reserve coefficient of underground rock mass stability is obtained. The results show that the microseismic monitoring data combined with stress field analysis can well realize the dynamic calibration of the rock mass strength parameters and provide an effective quantitative analysis method for the dynamic evaluation of the rock mass stability.