关键词: 地质力学模型, 拱坝-基础整体稳定性, 超载法试验, 杨房沟水电站

Abstract: With the development of testing technology, geomechanical model test has become an important method for stability and safety analysis of high arch dam. According to the similarity theory, a 3D geomechanical model with the proportion of 1∶200 was built up to simulate the arch dam and foundation, main faults, crack zone and other major geological condition. Destructive test based on overloading of hydraulic pressure was used to analyze the stress, deformation and stability of arch dam, foundation and abutment resistance body, and to study the stability of arch dam foundation, the process of instability and failure and overload capacity. The results were compared with the research results of domestic similar high arch dams, and a comprehensive evaluation of safety degree of Yangfanggou dam foundation stability was put forward. The results showed that, the safety degree of arch dam cracking was 2.5~3.0, the safety degree of nonlinear originated was 4.0~6.0, the limited safety degree of global stability was 11.0, which indicated the high global stability of Yangfanggou dam and foundation.

Key words: geomechanical model, global stability of dam and foundation, overload test, Yangfanggou hydropower station