09:45 〜 10:00
[HDS08-04] Dynamic Analyses of Multi-Block Rockfalls Using Modified 3D Discontinuous Deformation Analysis Focusing on Coefficient of Restitution
キーワード：地すべり、数値計算法、動的シミュレーション、反発係数
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.