Research On The Loading Capacity Of High Arch Dams

Now with the rapid development of water conservation, there appeared many constructed or to be constructed high arch dams, which don't satisfy the present code and experience, so it is necessary to do the basic application research on high arch dams. In this paper, the mechanism of fracture and loading capacity of four representative high arch dams are calculated and analyzed by using nonlinear finite element method.At first, some basic theories such as nonlinear finite element are introduced. And because different gridding's size would result in different values in the finite element analysis, some arch circles are chosen to analyzed in order to do some elementary discuss on how the gridding's size affect the calculated result.The criterion of failure state is still a difficult problem, especially in the numerical analysis. In this thesis, based on the detailed introduction about these methods used at present time, the failure state is analyzed in theory, and then the two methods that are the limitative strain and plastic limit analysis are discussed. According to the calculation and analysis of those arch dams, the relation between the displacement jump method and plastic zone juncture method is discussed, and the displacement jump method is considered to be more convenient and effective.Through these engineering examples, the displacement and stress distribution of high arch dams are summarized, and the destruction process and the mechanism of fracture of high arch dams are also obtained. Through the analysis and contrast, the difference of loading capacities of high arch dams with different height is discovered, moreover, the conclusion is proved theoretically.At last, the main work and conclusions of this paper are summarized, while some problems and some aspects that should be further researched are put forward.