| Stability of Gravity dam is always of great concern to designer and geological expert. The foundation of Baise gravity dam has bad geological phenomena such as high elastic modulus ratio, joint fissures and large faults etc., so stability of Baise gravity dam is the essential technical problem to project's success. In this thesis 3D non-linear FEM (Finite Element Method) and 3D RBSM (Rigid Body-Spring Model) are used to conduct the following research work:1. The mesh generation program of FEM is improved in the aspects of visualization and systematization.2. According to the geological conditions of Baise project, erosive bands and joint fissures, F6 fault and grout curtain are fully simulated to establish 3D numerical model of the dam and its foundation. 3D non-linear FEM is used to analyze the stress and strain and to appraise the operation state of both the dam and it's foundation under different operation conditions. By overloading the upstream water level and reducing rock strength parameter, the dam foundation's degradation process is simulated and the damage pattern and paths are determined, and finally the safety factor is determined.3. Based on the results of dam foundation's FEM stability analysis, possible sliding paths are supposed and 3D RBSM is used to find out most dangerous sliding bodies and sliding paths under static and seismic operating conditions.4. Sensitivity analysis of stress and strain under different elastic modulus combinations of dam foundation, different water levels, different seepage conditions is also conducted.5. Displacements of other gravity dams are collected and compared with the results of Baise project.
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