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根据地下洞室开挖和锚固施工方法,采用FLAC3D数值分析程序,对某大型水电站地下厂房复杂洞室群开挖过程进行了动态模拟,分析了在有、无支护条件下洞室周边围岩二次应力场、位移及破坏区分布规律和变化特征,说明采用隐含断层复合单元模拟断层、cable结构单元模拟锚杆、薄层实体单元模拟喷层能较合理反映地下洞室分期开挖实际力学作用机理.计算结果表明,该洞室群在洞室布局、开挖顺序和支护参数等方面是合理的,认为在局部加强支护的条件下,洞室的整体稳定可以得到保证.
According to the method of excavation and anchoring in underground caverns, the numerical simulation program of FLAC3D is used to simulate the excavation process of the complex caverns in the underground powerhouse of a large hydropower station. The analysis of the surrounding rock mass around the cavern with and without support Secondary stress field, displacement and failure zone distribution rules and characteristics of the variation, indicating that the use of implicit fault composite unit simulation fault, cable structural element simulation of rock bolt, thin layer solid unit simulation spray layer can reasonably reflect the actual underground stope excavation Mechanics mechanism.The calculation results show that the cavern group is reasonable in terms of the layout of the cavern, the excavation sequence and the support parameters, and the overall stability of the cavern can be guaranteed under the condition of partial strengthening of the support.