Study Of Global Safety Of Arch Dam Base On FEM And Cusp Catastrophe Theory

Arch dam is a kind of important style in hydraulic structures, compared withother type of dam. It is an economical and safe, reasonable structure and appearance.The high arch dams is particularly evident in the performance advantage. So, it isadopted widely in domestic and of reign high dam.Arch dam due to its own characteristics, comparing with other type dams moredifficulty in the general layout design of water resources and hydroelectric power. Inaddition, dam body is different. There are many problems to be solved. Recent years,arch dams construction has the huge development of our country. Correspondingly,the deformation and stress of the arch dams calculation, stability analysis, dynamicanalysis and seismic, temperature control and grouting and ground treatment, archdam optimization technology also has a great progress. With the western developmentstrategy, and the gradual implementation of national power capacity energy structureadjustment, the western region has emerged a large number of high arch damconstruction, most of them have been completed or prepare to build. Often thesecomplicated geological conditions of dam foundation rock mass, the design andevaluation methods have no specific basis to follow. Therefore, the stability analysisfor dam safety evaluation and presents many challenges.Busanga arch dam is researched in this paper, under different conditions on thenonlinear and dynamic analysis. In which, the dam and the bedrock use different unitmodels and failure criteria. Obtained under different conditions of stress displacementvalues, smeared crack distribution and so on. The geotechnical engineering cuspcatastrophe theory into the overall safety level for solving the dam. Solved theoverloading method and safety reduction method in nonlinear analysis how toaccurately determine overall structure load damage problem. Using mathematicalfitting method for solving the dam safety coefficient provides an effective method.By means of numerical simulation and arch dam optimization procedure after theanalysis of the calculated. Results show that: method of numerical simulation in thestress is obtained due to the results of the stress concentration phenomenon, at theangle of edge stress value is obvious than arch dam optimization program calculatedvalue. The results of numerical calculation method of safety coefficient solution relative to the optimization program is small, more close to the actual situation.Defective parts on the left abutment geology using high pressure consolidationgrouting treatment measures, through the process around abutment displacementvalue comparison, the two sides symmetrical uniform abutment displacement, nodisplacement of the fracture zone near the mutation, and the results feasible andeffective. Combined with dam destroyed smeared crack distribution, the dam figure ismade the appropriate optimization. Reducing the amount of RCC and saving theproject investment.