Simulating the rock avalanches using 3D DEM with Polyhedrons

Abstract

Large-scale rock avalanche has occurred frequently in recent years A large amount of sand and stone slide only in tens of seconds causing disasters This study simulate the large-scale rock avalanche by using numerical simulation to explore its sliding history and its impact range Help to delineate the impact potential area in large-scale rock avalanche in the future There are two cases in this study: the Xinmao Landslide which occurred in Xinmo Village Mao County China and the Nan-Shi-Keng which is located at 175 County Road in Tainan In the simulation a three-dimensional numerical model will be built and cut the discontinuous surfaceto simulate the stacking of the local terrain and the sliding block Finally discussing the landlside process of the slope of Xinmo Village and predicting the impactrange of the Nanyukeng Landslide The three Dimensional Distinct Element Code (3DEC) software belonging to the Distinct Element Method (DEM) was used in this study During the simulation the block slip simulate by a given gravity and a change in the different friction angle in the joints The simulation results of the landslide damage in Xinmo Village show that it is necessary to consider the self-lubricating effect of the friction angle reduction in the simulation when the block is sliding at high speed In addition the block above the Xinmo Village will significantly affect the behavior and accumulation of the simulation The simulation results of the Nan-Shi-Keng sliding show that if the sliding occurs in the area it will take about 30 seconds and the stacking rock in the Nan-Shi-Keng River will have a temporary dam with 390 meters long and of 30 meters height

Date of Award	2019
Original language	English
Supervisor	Jian-Hong Wu (Supervisor)