考虑颗粒状态转化的高位远程滑坡数值模拟方法

doi:10.13722/j.cnki.jrme.2022.1174

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Abstract The movement process of high-position and long-runout landslides is complex and the sliding main body is changeable. The dynamics theory of post-failure and inversion prediction technology have always been the focus and difficult problems in the field of disaster prevention and reduction. In this paper，the dynamic process of polymorphic transformation based on the degree of density in the movement of high-position and long-runout landslide is revealed by survey analysis，theoretical research and numerical technology development. Based on SPH and DEM algorithm and dynamical constitutive model transformation，a new numerical simulation method for landslide post-failure motion(LPF3D) is presented. The results show that：(1) Through the analysis of actual landslide video and grains chute experiment recording，it is found steric effect which the grains motion in the process of landslide movement mainly present the dense state，dilute state and ultra-dilute state，and the grains state changes and transforms with each other at all times. (2) The volume fraction is used as the criterion of discrete grains number and grains state transformation，and the numerical calculation method and critical volume fraction is proposed to solve different states in landslide movement based on different dynamical constitutive models. (3) The macroscopic continuum algorithm based on the theory of polymorphic transformation is used in the inversion of the debris flow of Jiweishan landslide in Wulong，Chongqing，and the simulation results are basically consistent with the actual landslide accumulation. (4) The LPF3D simulation method achieved the transformation of grains state and the efficient calculation of the actual number of grains in the calculation of landslide failure movement，and improves the convergence stability of the calculation，which has great computational advantages. Based on the above research，it is believed that in the risk investigation and dynamic process analysis of high-position and long-runout landslide flow，the influence of the state changes of sliding body grains and the actual number of grains should be fully considered. The LPF3D simulation method provides an efficient，quantitative and optional method for the risk assessment and prediction of high-position and long-runout landslide.

Key words： slope engineering high-position and long-runout landslide grains state LPF3D numerical simulation

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	Articles by authors
	GAO Yang1
	2
	YIN Yueping3
	LI Bin1
	2
	ZHANG Han4
	WU Weile4

Cite this article:

GAO Yang1,2,YIN Yueping3, et al. Numerical simulation method of high-position and long runout landslides under granular state transformation[J]. , 2023, 42(7): 1623-1637.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1174 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I7/1623

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