Modified two-phase dilatancy SPH model for saturated sand column collapse simulations

doi:10.1016/j.enggeo.2019.105219

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地灾害与地表过程重点实验室

	Modified two-phase dilatancy SPH model for saturated sand column collapse simulations
	Liang Heng 1,2; He Siming1,3,4 ; Chen Zheng 1,2; Liu Wei1,3
刊名	Engineering Geology
	2019
卷号	260 页码:UNSP 105219
关键词	Diffusion in liquids Drag Hydrodynamics Landslides Newtonian liquids Pore pressure Sand Volume fraction
ISSN号	0013-7952
DOI	10.1016/j.enggeo.2019.105219
产权排序	1
文献子类	Article
英文摘要	The 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.
语种	英语
WOS记录号	WOS:000495469800015
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/26626]
专题	成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
通讯作者	He Siming
作者单位	1.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
推荐引用方式 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:UNSP 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,UNSP 105219.
MLA	Liang Heng,et al."Modified two-phase dilatancy SPH model for saturated sand column collapse simulations".Engineering Geology 260(2019):UNSP 105219.