| Stability of arch dam foundation and abutment is always of great concern to designer and geological experts. The abutment of Jinping high arch dam is pierced through by large faults, such as fault f5 in left abutment, and fault f13 and f14 in right abutment, in addition, there exists a lot of joint fissures. So stability of Jinping high arch dam is an essential technical problem to the project's success. In this thesis, 3D RBSM (Rigid Body-spring Model) and the Multi-block limit equilibrium method are used to conduct the following research works:1. A new method for 3D mesh automatic refinement is proposed so that 3D numerical model can be generated in an semi-automatic manner.2. According to the geological conditions of Jinping project, faults, erosive bands, deep tensile cracks and joint fissures are fully simulated to establish 3D numerical model of the arch dam, foundation and abutment.3. Altogether 17 possible slip bodies along fault f5, f13, f14, lamprophyre X, deep tensile cracks and squeezes of the dam abutment are studied. The safety factors of all bodies are calculated under different working conditions such as natural, reinforcement and earthquakes (Loma wave and artificial wave) using RBSM. It is shown that the stability on left bank is controlled by a slip body, whose side surface is formed by fault f5, and bottom surface cuts through â…¢2 rock mass , and between the side surface and bottom surface is fault f2.4. Using multi-block limit equilibrium method, this thesis studied the most dangerous slip body on left bank again, providing additional verification of its safety behavior. 5. Safety factor data of other arch dams are collected and compared with the results of Jinping project.
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