大型地下洞室群开挖的三维弹塑性有限元分析

基于弹塑性围岩理论，对构皮滩水电站地下洞室群的开挖进行了有限元数值模拟，对开挖后围岩的位移场、应力场及塑性区特征进行了比较分析。结果表明，构皮滩水电站整个洞室群的围岩基本上是稳定的，但在局部工程部位（洞室群的两洞相交处和岩体节理劈理出露部位等）出现了较大位移和应力集中，施工过程应注意合理支护。

Study on Excavation of Large Underground Caverns by 3D Elastic-plastic FEM

Based on the theory of elastic-plastic wall rock, the excavation for underground caverns of Goupitan power station was simulated by FEM, which analyses the characters of stress field, displacement field and plastic zone of surrounding rock masses after excavation . The results show that the whole underground caverns are basically stable, except that relatively large displacements and stress concentration occurs in some parts of the project. Therefore, properly support should be necessary during the process of construction.