清江水布垭水利枢纽放空洞三维稳定性分析

3-D Stability Analysis on Emptying Tunnel of Shuibuya Project on Qingjiang River

放空洞是水布垭水利枢纽的重要建筑之一,为大型地下洞室。放空洞闸室围岩处于上硬下软、软硬相间的复杂地质条件下。施工开挖过程中,放空洞工作闸室围岩应力及稳定性,以及运行期弧形门支座岩体的变形与稳定等问题是设计部门所关注的重点。采用3D-σ三维弹塑性有限元程序,分析了开挖及不同运行状态对放空洞围岩的应力、变形和稳定性的影响。数值分析结果可为设计部门提供参考。

As one of the key constructions of Shuibuya Project on Qingjiang River, the emptying tunnel is a large - scale underground cave. The surrounding rockmass of trainter gate are under complex geological condition that features alternatively distributed soft and hard rock layers. The stress and stability of surrounding rockmasses of working room during excavation, and the deformation and stability of the rock foundation of trainter gate during running time, are some most concerned issues for the design department of this project. With 3D - σ FEM software, the stress, deformation and stability of surround rockmasses of emptying tunnel during excavation and various working conditions are researched.