Numerical simulation of landslide-generated waves using a soil–water coupling smoothed particle hydrodynamics model

• Published in: Advances in water resources Vol. 92; pp. 130 - 141
• Main Authors: Shi, Chuanqi, An, Yi, Wu, Qiang, Liu, Qingquan, Cao, Zhixian
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.06.2016
• Subjects: Computational fluid dynamics; Computer simulation; Coupling; Dilatancy angle; Elasto–plastic model; Fluid flow; Hydrodynamics; Landslide induced impulse waves; Mathematical models; Navier-Stokes equations; Smoothed particle hydrodynamics; Soil mechanics; Soil–water coupling; Elasto–plastic model; Smoothed particle hydrodynamics; Soil–water coupling; Landslide induced impulse waves; Dilatancy angle
• ISSN: 0309-1708; 1872-9657
• DOI: 10.1016/j.advwatres.2016.04.002

•A soil-water coupling model including an elasto–plastic soil constitutive model is developed in the SPH framework.•Values of key model parameters are obtained in laboratory directly and the landslide deformation details during impact are revealed.•The numerical results are satisfying for both slow and fast landslides comparing with experimental data.•The effect of dilatancy on the landslide is significant. We simulate the generation of a landslide-induced impulse wave with a newly-developed soil–water coupling model in the smoothed particle hydrodynamics (SPH) framework. The model includes an elasto–plastic constitutive model for soil, a Navier–Stokes equation based model for water, and a bilateral coupling model at the interface. The model is tested with simulated waves induced by a slow and a fast landslide. Good agreement is obtained between simulation results and experimental data. The generated wave and the deformation of the landslide body can both be resolved satisfactorily. All parameters in our model have their physical meaning in soil mechanics and can be obtained from conventional soil mechanics experiments directly. The influence of the dilatancy angle of soil shows that the non-associated flow rule must be selected, and the value of the dilatancy angle should not be chosen arbitrarily, if it is not determined with relative experiments. [Display omitted]