Static-Dynamic Stability Analysis Of Tailing Dam And Its Application

In long time the analysis of the slope stability has been an very important research problem in Geotechnical Engineering. The slope stability is affected by a lot of factors such as the mechanical character of the slope material, the geometrical dimension of the slope, the surrounding load of the slope and so on. So the deformation and failure of the slope are very complex, mostly including slippage, dilapidation, dumpage, creepage, desquamate, fluxion and so on. So far we pay more attention to the failure analysis of the slippage. There are usually two methods in the analysis of the slope stability, one is the critical equilibrium method, the other is the numerical analysis method considering the stress-strain relation of the soil body. The critical equilibrium method is doubted because it can not factually reflect the stress field and the displacement field during its instability process. While the numerical analysis method not only can provide character of the stress and displacement based on losing stability process, but also can give out the description of stability state. The thesis applied the limited element to analyze the tailing dam of HeNan ZhongYuan Gold smelt factory by the engineering project. According to the geological conditions of tailing dam, every different layer of soil are fully simulated to establish 2D numerical model of the dam and its foundation. By using APDL in the light of ANSYS, the nonlinear finite element method program for static analysis of tailing dam are developed in this thesis. Duncan-Chang'Ε?μmodel is applied to the nonlinear analysis. Furthermore, according to the characteristics of the dynamic response analysis of tailing dam. The equivalent linear viscosity-elasticity model is adopted. This model not only bases on the linear viscosity-elasticity theory but also considers the nonlinear nature of soil. On the principle of equilibrium and Mohr-Coulomb failure criterion, method of element safety factor is developed in this thesis. It can determine the critical slip surface and the stability factor of this slip surface. And then it eliminates some artifical assumption whicht are used now in the critical equilibrium method of slope stability. By using ANSYS, the nonlinear static and nonlinear dynamic analysis of the tailing dam are finished. The distributions of the stress and strain have been worked out; and 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 provide the theoretical foundations for the Dam's Safety.