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随着地下矿山开采向深部逐渐延伸,断层滑移引起的岩爆事件日益增多且破坏性极大,已经成为威胁矿山安全的重要因素。通过建立三维离散元模型,基于平面应变问题,开展了三维模型平面应变等效计算与二维离散元模型对比分析,结果表明该研究模型在三维空间模拟地震波的传播是可行的。通过研究辐射特征对应力波传播的影响,揭示了P/S波传播过程的方向性并进行了验证,计算结果符合断层滑移的双力偶模型。在此基础上,通过与Kaiser等提出的设计尺度率公式进行对比,发现已有的设计尺度率公式并不能完全满足工程实际要求,利用三维离散元程序开展数值计算分析能够进一步优化支护参数,以此更好地服务矿山支护系统设计,确保地下矿山安全高效开采。
With the extension of underground mining to the deep, the rock burst caused by fault slip is increasing and destructive, which has become an important factor threatening mine safety. By establishing three-dimensional discrete element model and based on the problem of plane strain, comparative analysis of plane strain equivalent calculation and two-dimensional discrete element model of three-dimensional model is carried out. The results show that it is feasible to simulate seismic wave propagation in three-dimensional space. By studying the influence of radiation characteristics on the propagation of stress waves, the directivity of the P / S wave propagation process is revealed and validated. The calculated results accord with the dual couple model of fault slip. On this basis, by comparing with the design scale rate formula proposed by Kaiser et al., It is found that the existing design scale rate formula can not fully meet the actual project requirements. The use of three-dimensional discrete element program for numerical calculation and analysis can further optimize the support parameters, In order to better serve the mine support system design, to ensure the safe and efficient mining of underground mines.