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由人工截断边界输入地震波,通过时程积分法确定地震荷载作用下边坡的应力和变形,在人工截断边界上采用黏-弹性人工边界条件模拟地基辐射阻尼的影响。采用有限元强度折减法求解边坡稳定安全系数,以塑性区贯通时刻特征点的位移突变作为边坡失稳的评判标准。非线性有限元和黏-弹性人工边界条件结合运用,建立了基于静动力有限元的边坡抗震稳定分析方法。该方法在稳定安全系数的定义上和传统的刚体极限平衡法是一致的。以十里铺水电站为工程实例,分析了库区边坡的抗震稳定性,得出了边坡动力位移时程和动力稳定安全系数,计算结果合理评价了实际工程在地震荷载下的稳定性。
The seismic waves were input by the artificial truncation boundary. The stress and deformation of the slope under earthquake load were determined by the time-integration method. The artificial damping boundary was simulated by the viscous-elastic artificial boundary conditions. Finite element strength reduction method was used to solve the safety factor of slope stability. As a criterion of slope instability, the displacement sudden change of characteristic points at the time of plastic zone penetration was taken as the criterion. Nonlinear finite element and viscous - elastic artificial boundary conditions combined with the use of static and dynamic finite element method to establish a stability analysis of the slope. This method is consistent with the traditional rigid limit equilibrium method in the definition of stable safety factor. Taking Shilipu Hydropower Station as an example, the seismic stability of slopes in the reservoir area is analyzed, and the dynamic displacement time history and dynamic stability safety factor of the slope are obtained. The calculation results reasonably evaluate the stability of the actual project under earthquake load.