Modified two-phase dilatancy SPH model for saturated sand column collapse simulations
Liang Heng1,2; He Siming1,3,4; Chen Zheng1,2; Liu Wei1,3
Source PublicationEngineering Geology
Contribution Rank1
AbstractThe high mobility of landslides generates a serious risk of death and property damage. In this study, we develop a two-phase smoothed particle hydrodynamics (SPH) model based on mixture theory to investigate high mobility landslide mechanisms by simulating the process of saturated sand column collapse for different solid volume fractions and permeabilities. The dilatancy coefficient of volume fraction dependence and the Drucker-Prager criterion are introduced into an elastic-perfectly plastic model to describe the solid phase mechanic behavior, and the fluid phase is described as a slightly compressible Newtonian fluid. We present the deposition profile shape and apparent slope evolution trends of collapse examples for different initial solid volumes and permeability changes. We then analyze the effective stress, pore pressure, and velocity during the collapse process of extremely low permeability sand columns to explain the mechanism behind collapse evolution trends. We conclude that shear contraction behavior improves the mobility of the solid-fluid mixture by increasing the pore pressure and decreasing the effective stress, and vice versa. During the shear contraction process of column collapse, the lower permeability, slower seepage rate of the fluid phase, and lower pore pressure diffusion rate result in stronger mobility, but the larger drag force coefficient retards sand column collapse. Numerical simulation results show that the proposed model corrects some limitations of existing three-dimensional SPH models and can be applied to research the motion mechanism of solid-fluid mixtures such as landslides and debris flows. © 2019 Elsevier B.V.
KeywordDiffusion in liquids Drag Hydrodynamics Landslides Newtonian liquids Pore pressure Sand Volume fraction
Indexed ByEI
EI Accession NumberAccession number:20192807172309
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Document Type期刊论文
Corresponding AuthorHe Siming
Affiliation1.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, China;
2.University of Chinese Academy of Sciences, Beijing, China;
3.Key Laboratory of Mountain Hazards and Surface Process, Chinese Academy of Sciences, Chengdu, China;
4.CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Corresponding Author Affilication中国科学院水利部成都山地灾害与环境研究所
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GB/T 7714
Liang Heng,He Siming,Chen Zheng,et al. Modified two-phase dilatancy SPH model for saturated sand column collapse simulations[J]. Engineering Geology,2019,260:105219.
APA Liang Heng,He Siming,Chen Zheng,&Liu Wei.(2019).Modified two-phase dilatancy SPH model for saturated sand column collapse simulations.Engineering Geology,260,105219.
MLA Liang Heng,et al."Modified two-phase dilatancy SPH model for saturated sand column collapse simulations".Engineering Geology 260(2019):105219.
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