Strength And Stability Analysis Of Super-high Arch Dam

The strength and stability analysis of Super-high arch dams built in conditions of complex topography and geology is an important subject in arch dam design and research. So establishing FEM simulation model which can reflect the actual stress state and analyzing its strength and stability characteristic becomes an important and complex part in design procedure of Jinping Arch Dam.In the design procedure of Jinping Arch Dam, 3 design schemes were put forward. In this dissertation, based on the actual geological data of Jinping Arch Dam, the FEM model of detailed scheme 3 is established in FEM program ANSYS. Linear elastic analysis indicates that control point of compression stress mainly appears in the both ends of the arch and maximum tension stress emerges in dam toe. Corresponding distribution status of stress accords with the law of stress distribution. Comparative analyzed with feasibility study scheme, detailed scheme 1 and detailed scheme 2, optimum scheme of arch dam shape is put forward from stress and displacement optimization.The correction factor of compression stress based on linear analysis result of FEM is advanced for arch dam more than 200 meters high. The correction factor of tension stress based on of FEM equivalent stress is put forward for arch dam less than 200 meters high. Based on the analysis result of detailed scheme 3 of Jinping Arch Dam by FEM, the correction factor of compression stress of itself is obtained, and is compared with the one of arch dams more than 200 meters high. The rationality of the correction factor of compression stress advanced in the dissertation is certified.The stability of arch dam is studied. The reasonable line shape of arch and the optimal central angle in condition of stabilization of dam body is discussed. From planar and spatial buckling analysis of detailed scheme 3 of Jinping Arch Dam, the overload coefficient is obtained. Compared with the control criterion of strength, the failure mode of Jinping Arch Dam is found, that is, failure is governed by strength, and buckling will not take place.