许家湾水库大坝除险加固及其稳定性分析

为解决许家湾水库长期存在的防洪能力不足、坝体渗漏、排水系统不完善及白蚁蛀蚀坝基等安全隐患问题，结合区域工程地质条件和具体问题，运用理论分析、计算及数值模拟等方法对许家湾水库大坝提出了针对性除险加固方案，并开展了相关的可行性研究。结果表明:除险加固方案有效可行，大坝渗流及稳定验算满足要求；各工况下，许家湾水库大坝整体处于稳定状态，但地震对于大坝稳定性影响显著；天然工况及地震工况下，坝体下游端均存在潜在不稳定体，在极端条件下可能出现坝体失稳危险，建议加强后期监测。

Reinforcement and Stability Analysis of Xujiawan Reservoir Dam

In order to solve the long-term potential safety problems of Xujiawan reservoir, such as insufficient flood control capacity, dam leakage, imperfect drainage system and termite erosion of the dam foundation, combined with the regional engineering geological conditions and specific problems, a targeted reinforcement scheme for Xujiawan reservoir dam was proposed by theoretical analysis, calculation and numerical simulation and related feasibility study was carried out. The research shows that the proposed reinforcement scheme is effective and feasible, and the dam seepage and stability check meet the requirements. Under all working conditions, the Xujiawan Reservoir dam is in a stable state, but the earthquake has a significant impact on the dam stability. Under natural and seismic conditions, there are potential unstable bodies at the downstream end of the dam body, and under extreme conditions, the dam body may be unstable. It is recommended to strengthen the later monitoring.