3-D Nonlinear Finite Element Analysis And Program Developing On Concrete Arch Dam Abutment Stability

Arch dam has already been applied widely because of its safety and economy.The stability of arch dam is sustained by abutment rock mass. Neglecting the partialgeologic defect of batholith will probably induce instability destruction of Arch dam.Therefore, abutment stability is vital to the design and research in arch dam.So far, rigid body limit equilibrium method has been primarily used forcalculation on the abutment stability in practice, the force which is transferred fromdam 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. Theirstress-strain relationship is obviously nonlinear. Meanwhile, the stress of arch damwill 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 studyingabutment stability analysis method and theory, concrete arch dam 3-D nonlinear FEMprogram is developed by APDL and functions On ANSYS. The program can analysestress-strain of arch dam on batholith with geologic defect, and then evaluateabutment stability by three safe-coefficient from different points of view.In this paper, the abutment stability of ShanKouYan arch dam in JiangXiprovince is analysed by 3-D nonlinear finite element method. The result is contrastedto the one which is drawn by rigid body limit equilibrium method, and it isreferential to design, optimization, construction, operating of the arch dam.