地下洞室群围岩弹塑性有限元分析及施工优化

The elastic-plastic finite element analysis on the surrounding rocks of the caverns and the optimization of its construction alternatives

天荒坪抽水蓄能电站地下厂房开挖工期只有 2 2个月 ,地下洞室群复杂 ,洞室交错 ;为此 ,华东勘测设计研究院在施工中结合实际揭露的地质情况和施工进度安排 ,以厂房开挖为关键路线 ,采用三维弹塑性有限元分析 ,对洞室群的施工进行了整体优化。通过三维弹塑性有限元分析 ,得出了开挖过程应力、位移和屈服范围的变化规律 ,认为围岩不会出现拉裂或挤压破坏 ,并发现洞室开挖的相互影响 ,从而有效地指导了施工开挖和支护 ,实践中取得了很好的效果。

The planned excavation period of the underground powerhouse of Tianhuangping Pumped storage Power Plant is only 22 months. Because of the complicated and crisscross underground caverns, the East China Investigation and Design Institute, taking the excavation of the powerhouse as key line, optimized the construction of the caverns as a whole by adopting the three dimensional elastic plastic finite element analysis method in combination with the actual discovered geological conditions and the construction progress schedule. According to the elastic plastic finite element analysis, the change laws of stresses, displacement and yielding range during the excavation were gained. The results showed that no tension crack or crushing failure of the surrounding rock occurs. Therefore, it effectively guided the excavation and support in the construction and gained good results in the practice.