ABSTRACT

Modified Newmark method is proposed including the equivalent seismic loading and critical acceleration dependant on the dynamically exerted plastic yielding and tension cutoff effects along the base of the sliding mass. The fully nonlinear FE analysis is based on elasto-plastic Mohr-Coulomb material model. The proposed algorithm was validated in an example of 72 m high tailings dam. The Newmark permanent displacements were compared with the average plastic deformations resulting from the nonlinear Mohr-Coulomb model. The comparison shows satisfactory agreement for low to moderate nonlinear slope behavior. For deep nonlinearity, the modified Newmark method can be used as a decision-making tool only.

摘要

提出了改进的 Newmark 方法，包括等效地震载荷和临界加速度，取决于沿滑动块底部动态施加的塑性屈服和张力截止效应。全非线性有限元分析基于弹塑性 Mohr-Coulomb 材料模型。所提算法以 72 m 高尾矿坝为例进行了验证。将 Newmark 永久位移与由非线性 Mohr-Coulomb 模型产生的平均塑性变形进行了比较。比较显示了低到中等非线性斜率行为的令人满意的一致性。对于深度非线性，修改后的 Newmark 方法只能用作决策工具。