Analysis Of Stability Of Jinping High Arch-Dam Based On Nonlinear Finite Element Method

Jinping is a huge project located on Yalong River in China. Its dam is concrete arch dam with Max height of 305.0m, which surpass Ingury and Xiaowan, and will be the highest arch dam in the world. The stability analysis of super-high arch dams is very important in this project. The paper is based on ANSYS, a big FEM simulation software. Integrated with a project of Jinping Water Power Station, the failure state and abutment stability are studied systematically with 3D elastic-plastic finite element method in this paper.First, the basic theory and method of elastic-plastic and nonlinear in FEM simulation analysis in rock engineering and water conservancy engineering are studied.The criterion of failure state is still a difficult problem, especially in the numerical analysis. In this thesis, based on the detailed introduction about these methods used at present time, the failure state is analyzed in theory, and then the two methods that are the limitative strain and plastic limit analysis are discussed. According to the calculation and analysis of those arch dams, the relation between the displacement jump method and plastic zone juncture method is discussed, and the displacement jump method is considered to be more convenient and effective.Then, the initial geological stress of dam site is simulated in ANSYS. Using three-dimensional nonlinear FEM and considering accumulative gravity and water pressure as initial load, overload method and margin of safety method are adopted to analyze the failure process of JinPing arch dam, and the safety factors of integral stability and characters of failure are acquired.Finally, some problems needed to be studied further are discussed.