FEM Analysis And Study On The Masonry Gravity Dam With Weak Interlayers Embeded In The Foundation

Because of its economy and safety, the masonry gravity dam is used in many medium and small-sized engineering. As the foundation of other analysis in gravity dam's designment, stress and stability analysis is an significant segment. Traditional calculating methods have lower adaptability and can't meet the demand of designment. With the development of FEM(finite element method) theory and CAE software, it has great engineering signality and practical value to analyse the masonry gravity dam by the way of FEM method.After summarizing various analytic methods, the basic principle of FEM theories to the gravity dam are formulated briefly in this paper. The program structure of ANSYS sofeware and its basic analytic process are introduced. Combined with the Majiayan Dam, FEM software ANSYS is adopted to simulate the dam's nonlinear character and to analyse the structure's performance. In the modeling process, the influence of displacement pattern, element shape and boundary condition to the dam's displacement and stress are take into account. The masonry gravity dam's anisotropic elasticity and minipore stress are systematically analyzed. The calculating method on weak interlayer problem in ANSYS sofeware is detailedly studied. With the calculating and analyzing to the numerical example, and also with the powerful postprocessing function of ANSYS sofeware, the dam's stability against sliding is analyzed in-depth. The Drcker-Prager criterion and elastic-perfectly plastic model is used to simulate the bedrock with weak interlayer. Combined with the project of Majiayan dam, the stress and deforming are studied in different working conditions under complicated loadings, the stress distribution in the cavities and hell are studied with special care and stress concentration problems are studied too. The temperature stress caused by the temperature change during the gullet pouring is studied simply. The researching results provide significant technical warranties for the project designment and have great referenced value to similar dam works'structure analysis.