A Numerical Model Of Dual Layer For Rapid Long Run-out Landslide And Its Application

Liquidity rapid long run-out landslide is a common form of landslide in the loess region.It has the characteristics of both high speed and long distance of transportation,which seriously threatens folks 'lives and properties in the loess area.Therefore,the spatial prediction of liquidity rapid long run-out landslide is of great significance to its risk assessment and disaster prevention and reduction work.This paper presents a new numerical model of rapid long run-out landslide based on the survey results of landslides in the south of Jingyang county.The definition and movement characteristics of this type of landslide are given in this paper.Based on the landslide motion model proposed by Sassa,a numerical model of dual layer for rapid long run-out landslide has been established.The force conditions of the sliding body control unit were analyzed for single and double-slides.The mathematical model of the double layer model is established according to the continuity equation and momentum equation.The mathematical model is discretized by the finite difference method,and the Landslide-Dual Layer(LS-DL)software is programmed based on the Visual Basic programming platform.The software can simulate the complete motion process of the three-dimensional landslide.Three numerical experiments,including the three-dimensional landslide,improve the dam-break experimental simulation and surge test simulation,were used to verify the correctness and rationality of the simulation results from different angles.In the end,the LS-DL software was used to simulate the Dabaozi landslide,a typical rapid long run-out landslide in Jingyang.The changing process of the thickness and velocity of the sliding body during the movement was analyzed.The simulation results and the measured terrain were basically the same.Through the above work,the practicability of this model is proved.The two-layer model of high-speed and long-term landslide proposed in this paper theoretically explains the movement mechanism of landslide in Jingyang,which is a typical class of rapid long run-out landslides.The LS-DL software developed by the project can be applied to the simulation of the motion of these kind of landslides.The space prediction,risk assessment and related research of high-speed and long-term landslides of mobility provide certain references.