Japan Geoscience Union Meeting 2024

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[E] Oral

H (Human Geosciences ) » H-DS Disaster geosciences

[H-DS08] Landslides and related phenomena

Fri. May 31, 2024 9:00 AM - 10:30 AM 106 (International Conference Hall, Makuhari Messe)

convener:Gonghui Wang(Disaster Prevention Research Institute, Kyoto University), Masahiro Chigira(Fukada Geological Institute), Fumitoshi Imaizumi(Faculty of Agriculture, Shizuoka University), Hitoshi SAITO(Graduate School of Environmental Studies, Nagoya University), Chairperson:Fumitoshi Imaizumi(Faculty of Agriculture, Shizuoka University), Kongming Yan(Kyoto University)

9:45 AM - 10:00 AM

[HDS08-04] Dynamic Analyses of Multi-Block Rockfalls Using Modified 3D Discontinuous Deformation Analysis Focusing on Coefficient of Restitution

*Changze Li1, Gonghui Wang1 (1.Kyoto University)

Keywords:Landslide, Numerical Method, Dynamic Simulation, Coefficient of Restitution

Rock avalanches are massive, extremely rapid, far-reaching landslides from abrupt rockfalls, and rockslides caused by earthquakes, heavy rainfall, and human activities. Rock avalanches involve the disintegration of initially intact rock masses during descent, creating highly fragmented debris that spreads over vast areas within minutes. In this study, we employ the 3D DDA method to simulate multi-block rockfalls, to analyze the impacts of the coefficient of restitution (COR) and friction angle on runout distance, velocity, and the H/L ratio. Firstly, the 3D DDA framework is modified to simulate energy loss during collisions, namely the simulation of the coefficient of restitution. Its accuracy is verified through the simulations of various rebounding models. Then we utilize the modified 3D DDA method to simulate the muti-block rockfall models with different COR values to investigate its effects. Subsequently, the effect of surface friction angle is also studied.