二塘沟水库左坝头岩石块体数值模拟分析

Numerical Simulation Analysis of the Ertanggou Reservoir Left Abutment Rock Body

通过调查二塘沟水库坝址区工程地质条件,初步分析了坝址区工程地质条件和水库左坝头岩石块体形成的地质环境、破坏机理。仅考虑边坡岩体自重力作用和暴雨作用,采用有限元法对二塘沟水库左坝头岩石块体进行了数值模拟分析。结果表明:只在重力作用下水库左坝头岩石块体下滑位移值不大,暴雨后X、Y方向的位移值比暴雨前大得多;暴雨后岩石块体从上往下、从左到右有明显移动,岩石块体以牵引式位移为主,下滑体体积比暴雨前增大,塑性区对比暴雨前有明显贯通,暴雨后岩石块体稳定性明显降低。

Through investigating the engineering geological conditions of Ertanggou Reservoir dam site, the paper preliminarily analyzed engineering geological conditions of the dam site and the geological environment and failure mechanism of formation of reservoir left abutment rock block. Only considering the slope rock mass gravity action and effect of rainstorm, numerical simulation analysis of the Ertanggou Reservoir left abutment rock block was carried out by using finite element method. The results show that the reservoir left abutment rock blocks under gravity of rock blocks slipped displacement values; after the storm, X direction and Y direction displacement value is much larger than before the storm; after the storm the rock blocks are obviously moved from top to bottom, from left to right, with the rock block displacement in the main of traction type and drop- ping volume bigger than before the storm ; the plastic zone is compared through before the storm and rock block stability is decreased significantly af- ter storm.