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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。
By investigating the engineering geological conditions in the dam area of Ertanggou Reservoir, the geological environment and the failure mechanism of the rock mass of the dam in the dam are analyzed preliminarily. Considering only the effect of gravity and heavy rain on slope rock mass, finite element method is used to simulate the rock mass of the left dam head in Er tang Gou reservoir. The results show that the displacement of the rock mass in the left dam head is not large under the action of gravity only and the displacements in the X and Y directions after the heavy rain are much larger than those before the rainstorm. And the right is obviously moving. The block of rock is dominated by the traction displacement, and the volume of the gliding body is larger than that before the heavy rain. The plastic zone obviously passes through before the heavy rain, and the stability of the rock mass obviously decreases after the heavy rain.