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Dynamic reduction of rock mass mechanical parameters based on numerical simulation and microseismic data - A case study

机译：基于数值模拟和微震数据的岩体力学参数动态折减—案例研究

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摘要

Rock mass mechanical parameters change dynamically over time and space, and this process is accompanied by the release of seismic signals. With the aid of microseismic (MS) monitoring, the temporal, spatial and intensity source parameters that can reflect the rock mass damage were extracted from MS data, and the rock mass damage coefficient based on MS multiple source parameters was established. Taking Shirengou Iron Mine as a test site, discontinuity scanning was carried out, and the size of the representative elementary volume (REV) was obtained by analyzing the change of the joint mass densityP32with different lengths of the statistical cube. According to the spatial-temporal variation of source parameters that were used to construct the damage coefficient, the failure process and mechanisms were analyzed and the failure period was divided into five stages. The damage coefficient of each REV was calculated on the basis of the MS data combined with the rock mass damage, and the damage process in the rock mass failure process was also analyzed. Then, the REV damage coefficients in different time periods were embedded into the FLAC3Dcomputing program as inputs, and with the combination of the reduction formula, the rock mass mechanical parameters were dynamically modified. Taking shear strength as a representative property, the shear strength changes in different time periods were analyzed. In addition, the change of rock mass shear failure zones was analyzed. By combining the rock mass damage coefficient established by multiple source parameters with numerical simulation, the dynamic reduction of rock mass mechanical parameters can be realized, providing a new quantitative analysis method for dynamic evaluation of rock mass stability.
机译：岩体力学参数会随时间和空间动态变化，并且此过程伴随着地震信号的释放。借助微震监测，从质谱数据中提取出能够反映岩体破坏的时间，空间和强度源参数，建立了基于岩溶多源参数的岩体破坏系数。以石人沟铁矿为试验场地，进行间断扫描，并通过分析不同统计长方体的联合质量密度P32的变化，得到代表基本体积（REV）的大小。根据用于建立损伤系数的源参数的时空变化，分析了破坏过程和机理，并将破坏期分为五个阶段。根据MS数据结合岩体损伤计算出各REV的破坏系数，并对岩体破坏过程中的破坏过程进行了分析。然后，将不同时间段的REV破坏系数作为输入嵌入FLAC3D计算程序中，并结合折减公式，对岩体力学参数进行动态修改。以剪切强度为代表，分析了不同时间段的剪切强度变化。另外，分析了岩体剪切破坏带的变化。通过将多源参数建立的岩体损伤系数与数值模拟相结合，可以实现岩体力学参数的动态折减，为岩体稳定性的动态评价提供了一种新的定量分析方法。

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