Landslide-induced surges, as a complex type of fluid-solid coupling problem, are widespread in mountain regions and cause disastrous consequences. In order to reproduce the entire process of landslide-induced surge, by taking full advantage of material point method (MPM) in simulating large deformation of soil and gravity-driven flow of water, the two-phase double-point material point method (TPDP-MPM) was extended: a new algorithm handling the boundary without setting boundary particles was proposed. The classical submarine block-induced surge test and sand column collapse experiment were numerically simulated by the MPM and verified the effectiveness of the program. After that, the multiphase coupling process of Lituya Bay landslide-induced surge was simulated and verified the reliability of the TPDP-MPM code, which have achieved parallel computing by making use of OpenMP model. By comparing the results of numerical simulation with the model experiment, the two-phase double-point material point method can well simulate the starting, propagation, run-up and reflux stage of landslide-induced surge. Moreover, the extension mechanism of landslide-surge disaster chain in both time and space is revealed from the perspective of energy. This study provides a reliable tool for the analysis and assessment of landslide-induced surge disasters.

滑坡涌浪作为一种复杂的流固耦合问题，在山区普遍存在，造成的后果是灾难性的。为了重现滑坡引起涌浪的全过程，充分利用物质点法（MPM）模拟土壤大变形和重力驱动的水流，两相双点物质点法（TPDP） -MPM) 扩展：提出了一种无需设置边界粒子即可处理边界的新算法。用MPM对经典的海底块激涌试验和沙柱倒塌试验进行了数值模拟，验证了程序的有效性。之后，对利图亚湾滑坡涌浪的多相耦合过程进行了仿真，验证了TPDP-MPM程序的可靠性，利用OpenMP模型实现了并行计算。通过数值模拟结果与模​​型试验的对比，两相双点材料点法可以很好地模拟滑坡涌浪的起始、传播、爬升和回流阶段。此外，从能量的角度揭示了滑坡潮汐灾害链在时空上的延伸机制。该研究为滑坡诱发的涌浪灾害的分析和评估提供了可靠的工具。从能量的角度揭示了滑坡涌流灾害链在时空上的延伸机制。该研究为滑坡诱发的涌浪灾害的分析和评估提供了可靠的工具。从能量的角度揭示了滑坡涌流灾害链在时空上的延伸机制。该研究为滑坡诱发的涌浪灾害的分析和评估提供了可靠的工具。