Three-Dimensional Nonlinear Finite Element Analysis Of Dam Structure And Abutment's Stability In Xiluodu

The installed capacity is 14,400,000kw and the height of arch dam is 278m in Xiluodu hydroelectric power station. Structural features and abutments stability analysis is very important in thedesigndf arch dam. The simulated calculative method of three-dimensional nonlinearfinite element was applied in the abutments stability analysis of Xiluodu in this paper. By now, in the complex field of abutment stability analysis, there is still nocomplete method yet. The limit equilibrium method of rigid body, which is clear,easily understood in concept and simple to calculate, but there are still some defectsin it. Especially, as there are many interlayers and introformational disturbed belts inthe dam site and the anisotropy of rock masses is remarkable in vertical andhorizontal planes, how to reflect these geological conditions objectively and really isvery important to analyze and evaluate the structural features of dam body andabutments. By using the finite element method, these parameters such as stress,deformation and basic deflection in dam body, can be calculated accurately, and therock masses stability can be calculated quantitatively. In addition, the discontinuous,non-uniformity of rock masses, the nonlinear characters of the stress-strain relationand the anisotropy of its mechanical quantity can be considered too. Not only theelastic deformation of darn body and rock masses can be calculated, but thedevelopmental and evolutive process of destroy in the rock massed can be also traced.Parts of the past calculation results in finite element method about high arch damat home and abroad are collected to compare with other different projects. One of thecharacters of this paper is to simulate filly the distribution of the interlayer andintroformational disturbed belts in the abutments and dam base and to establish theinteractive three dimension integral model. Furthermore, the distribution of stressand deflection in dam body and darn base are calculated and analyzed by using three-dimensional nonlinear finite element method and stress-strain relation of anisotropy.Finally, safety coefficient methods of point strength reserve and integral overloadare applied to study on the work performance in normal working condition andoverload-destroyed characters. Through comprehensive analysis, we have found thepossible sliding forms of off-stability in the abutments and the critical area in rockmasses. A comprehensive and objective evaluation of abutments stability and workperformance of darn body in Xiluodu arch dam is made.