Static-Dynamic Analysis Of Earth-Rockfill Dam And The Safety Appraisal Of Huangbizhuang Major Dam

Huangbizhuang Reservoir is one of the reservoirs which are prone to dangers and accidents. To ensure its safe working , it is necessary to appraise the dam's safety. According to the stress-strain analysis of the dam, the law of the stress and strain change can be found. Based on the stress or shear failure section, the location where the cracks will appear can be defined. Thus,the safety of the dam can be appraised. By using APDL language, the linear and nonlinear finite element method programs for static analysis of dam are developed in this paper. Duncan-Chang E-B Model is adopted in the nonlinear analysis. On the basis of the process of the construction and water conservancy , the method of midpoint increment is used in the calculation . The solutions of some failed elements are adjusted through no-tensile-stress analysis or shear-failure disposal. Besides, Duncan-Chang E-B Model parameters of materials have been determined by the triaxial shear test in the laboratory. Data processing program and parameter calculation program by APDL language are also developed. Furthermore, according to the characteristics of the dynamic calculation, nonlinear finite element method program is developed to calculate the dynamic response analysis of dam . The equivalent linear viscosity-elasticity model is adopted in the calculation. This model not only bases on the linear viscosity-elasticity theory but also considers the nonlinear nature of soil. The full method uses the full system matrices to calculate the transient response and the Newmark time integration technique is used to solve the dynamic equation in ANSYS program. The calculation examples show that the solution is highly accurate; all the programs are proved to be credible and satisfactory. By using these programs, the linear, nonlinear static analysis and nonlinear dynamic analysis of the Huangbizhuang major dam are finished. The distributions of the stress and strain have been worked out; the stress and displacement accord with the general rule. The dynamic response is very weak. The whole calculation and analysis can prove the safety of the major dam, and these provide the theoretical foundations for the Dam's Safety Appraisal Work.