Analysis And Study Of Abutment Stability In ConcreteArch Dam By Three-Dimension Nonlinear Finite Element Method

The 3D abutment stability problem is very important in the design and study of arch dam. The stability of arch dam is sustained by abutment rock mass . Neglecting the partial geologic defect of batholith will probably induce instability destruction of arch dam. Therefore, abutment stability is vital to the design and research in arch dam.At present, rigid body limit equilibrium method has been primarily used for calculation on the abutment stability in practice, the force which is transferred from dam body to abutment adopts the result coming from arch cantilever trial load method. In fact , rock mass is not rigid and the material of arch dam is not elastic. Their stress-strain relationship is obviously nonlinear . Meanwhile, the stress of arch dam will redistribute obviously during the course of operating. Based on such a cognition, considering together the theories of concrete multi-parameter strength criterion , nonlinear stress-strain relationship and simulation analysis on the basis of studying abutment stability analysis method and theory, Theories of 3D nonlinear finite element Engineering-Geological model and concrete arch dam 3D nonlinear FEM program is studied by APDL and functions on ANSYS. The program can analyse stress-strain of arch dam on batholith with geologic defect , and then evaluate abutment stability by three safe-coefficient from different points of view.The paper, the abutment stability of ShanKouYan arch dam in JiangXi province is analysed by 3D nonlinear finite element method. The result is contrasted to the one which is drawn by rigid body limit equilibrium method, and it is referential to design, optimization, construction, operating of the arch dam.