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本文先将连续暴雨期稳定渗流的水力势与尾矿坝的变形紧密结合起来,列出平衡方程和拉普拉斯方程,用等参数有限单元法联立求解位移和水力势,计算静应力;其次将振动孔隙水压力引入平衡方程式中,用有限单元法求解地震期间的位移和水力势;最后将平衡方程式与不稳定渗流方程式结合起来,联立求解地震结束后的位移与水力势,实际上本文提出了一个适用于尾矿坝和土坝非线性静力分析和渗流分析的以及动力分析的二维有效应力方法.利用该法对德兴铜矿4号高尾矿坝作了具体计算,求得该坝在连续暴雨期间的静应力、流网、在地震期间和地震结束后的水力势、地震孔隙水压力的增长、扩散、消散以及液化的发生、发展、地震残余变形及其随时间的变化等等.
In this paper, we first combine the hydraulic potential of steady seepage and the deformation of tailing dam during the continuous rainstorm period, then we can get the balance equation and Laplace equation, and solve the displacement and hydraulic potential by the equivalent parameter finite element method to calculate the static stress. Secondly, the pore water pressure is introduced into the equilibrium equation, and the displacement and hydraulic potential during the earthquake are solved by the finite element method. Finally, the equilibrium equation and the unsteady seepage equation are combined to solve the displacement and hydraulic potential after the earthquake. In fact, In this paper, a two-dimensional effective stress method for nonlinear static analysis and seepage analysis of tailings dam and earth dam, as well as dynamic analysis, is proposed. Using this method, a specific calculation is made for No.4 high tailings dam in Dexing Copper Mine. The static stress of the dam during continuous heavy rainfall, the flow network, the hydraulic potential during and after the earthquake, the growth, spread and dissipation of seismic pore water pressure, and the occurrence and development of liquefaction, the residual deformation of earthquakes and their variation with time Change and so on.