In this study, Material Point Method (MPM) is improved to simulate coseismic slope stability and liquefaction-induced embankment failure under earthquake loading. First, by using elastic or elastoplastic models, topographic amplification and different slope failure modes are analyzed considering the effects of slope geometry, soil properties and excitation frequencies etc. The MPM model is then applied to predict a cascading slope failure process, including triggering, shear band formation, runoff and final deposition. Finally, a fully nonlinear bounding surface soil model is implemented in the two-phase soil-water coupled MPM framework to investigate the liquefaction mechanism and associated dam failure using two case histories. The numerical results are generally comparable with the post-failure profiles obtained from field investigation, which highlight the advantage of MPM in handling liquefaction-induced large deformation. The MPM shows great promise to quantitatively assess risk and consequence associated with seismic slope failure and soil liquefaction, thereby, advance the performance-based engineering design and analysis.

在这项研究中，改进了材料点法 (MPM) 来模拟地震荷载下的同震边坡稳定性和液化引起的路堤破坏。首先，通过使用弹性或弹塑性模型，考虑斜坡几何形状、土壤性质和激发频率等的影响，分析地形放大和不同斜坡破坏模式。然后应用 MPM 模型预测级联斜坡破坏过程，包括触发、剪切带形成、径流和最终沉积。最后，在两相土 - 水耦合 MPM 框架中实施完全非线性边界表层土壤模型，以使用两个案例历史研究液化机制和相关的大坝破坏。数值结果通常与从现场调查中获得的故障后曲线相当，这突出了 MPM 在处理液化引起的大变形方面的优势。MPM 在定量评估与地震边坡破坏和土壤液化相关的风险和后果方面显示出巨大的潜力，从而推进基于性能的工程设计和分析。