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为研究巷道开挖引起的卸载岩爆及岩爆过程细观层面行为特点,构建基于能量理论的三维改进岩爆模型,并通过颗粒流(PFC)分析程序PFC3D予以实现。总结相关文献,并根据细观层面上的岩爆发生过程,提出剩余能量转化方程。建立岩石耗散能和岩石可释放弹性应变能的计算方法。模拟某矿地质条件下不同深度岩体卸载后引起岩爆的过程。结果表明:-820 m工况下发生的岩爆,其发生时间极短;一次宏观岩爆是由多次微观岩爆叠加而成的;岩爆伴随着卸载面岩体突出变形,并可能导致卸载面坍塌。-420 m工况下开始发生轻微岩爆。
In order to study the characteristics of unloading rock burst caused by roadway excavation and meso-scale behavior during rockburst, a three-dimensional improved rockburst model based on energy theory was constructed and implemented by the PFC3D program of particle flow (PFC). Summarize the relevant literature, and according to the meso-level rock burst process, put forward the residual energy conversion equation. The establishment of rock energy dissipation and rock release elastic strain energy calculation method. Simulate the process of rock burst caused by unloading rock mass with different depth under certain geological conditions. The results show that the occurrence time of rockburst occurred at -820 m is extremely short. A macroscopic rock burst is formed by the superimposition of multiple micro-rock burst. The rock burst is accompanied by the prominent deformation of the rock mass at the unloading surface and may result in Unloading surface collapse. -420 m conditions began to occur slightly rock burst.