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Underwater landslide is a serious nature hazard which could occur at both sea floor and reservoir banks and results in massive destruction. It generally involves large deformation of landslide and water body, especially the interface between them. A numerical model for describing the soil-water interface and its large deformation in the framework of smoothed particle hydrodynamics (SPH) method is employed to simulate the evolution of underwater landslides. The elasto-plastic-viscous model with Dracker-Prager plastic yield rule is used for soil deformation simulation. And the direct forces exchange between interfacial soil and water particles is implemented to characterize the interface deformation. Both quasi-steady and dynamic behaviors of soil and soil-water interface during underwater landslide post-failure stage are revealed. Simulated results shows that the landslide body experiences strong deformation during the impact process.

underwater landslide; soil-water coupling; interface; smoothed particle hydrodynamics