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孟底沟水电站是雅砻江中游第5个梯级电站,最大坝高200 m,所处位置地质条件复杂,保证其蓄水后良好的工作性态及整体稳定性对工程安全至关重要。通过建立孟底沟拱坝三维有限元模型,基于变形加固理论,分析了拱坝在正常工况和超载条件下位移变化、塑形区扩展规律及大坝整体稳定性。结果表明:孟底沟拱坝现设计方案的位移和超载稳定能力均能达到稳定要求。拱坝贴脚的设置显著降低了坝体和基础的塑性余能,对工程整体稳定性有利。对右岸f4断层两种置换处理方式的对比分析发现,浅表置换加洞井网格置换的处理方式对拱坝整体稳定性更为有利。
Mengdinggou Hydropower Station is the fifth cascade hydropower station in the middle reaches of Yalong River. The maximum dam height is 200 m. Due to the complex geological conditions, it is very important for engineering safety to ensure good working behavior and overall stability after water impoundment. Based on the 3D finite element model of Mengdi Gully Arch Dam and based on the theory of deformation and reinforcement, the displacement of arch dam under normal working condition and overloading condition, the spreading law of plastic zone and the stability of dam are analyzed. The results show that the displacement and overloading stability of the design scheme of Mengdi Gorge can all meet the requirements of stability. The installation of arch dam footing significantly reduces the plastic residual energy of the dam body and the foundation, which is beneficial to the overall stability of the project. Comparing and analyzing the two kinds of displacement treatments on the right bank f4 fault, it is found that the treatment of shallow displacement and hole replacement is more beneficial to the overall stability of arch dam.