Numerical Simulation On The Process Of Typic Rock Avalanche And Associated Water Waves

Recent years, the rock avalanches having characteristics of highspeed, long run-out and high-position occure frequently.In the process of rock avalanches movement, the sliding body collides with high speed, then formatting of debris flow along the valley.The rock and soil mass entered rapidly into the river and generated impulsive wave. In recent years, the numerical simulation of rock avalanches and water waves is widely used. Selected Fuquan landslide and Jiguanling rockslide-debris flows as typical examples, the process of run-out movement of subaerial landslide is simulated by the dynamic analysis software(DAN-W). Based on the DANW simulation results, the subaqueous landslide surge numerical model is established by FLUENT to study propagation process of water waves. The following conclusions are obtained by the above research:1. Selected Jiguanling rockslide-debris avalanche and Fuquan landslide as typical examples, ideal models by the dynamic analysis software(DAN-W) are established. The velocity contours of landslide, depth variation of sliding mass and the shape of sliding body are also calculated. Basic of the simulation results about DAN-W, detailed computational fluid dynamics(CFD) is used to simulate landslide generated water waves.2. This paper presents the numerical modeling of Heinrich physical model test based on FLUENT. During the slide into the water along the slope, the impulse waves and its propagation process are simulated. The numerical analysis is well agreed with the experimental results, providing the possibility for the simulation of landslide surge disaster.3. Summarize deposit features and geological conditions of Jiguanling rockslide-debris avalanche and Fuquan Landslide. Basic of the simulation results about DAN-W, detailed computational fluid dynamics(CFD) is used to simulate Jiguanling rock avalanche and Fuquan landslide generated water waves. In this paper, the sliding bodys are equivalent to fluid in the process simulation of water waves.4. Present three-dimensional model test based on the computational fluid dynamics(CFD) package FLUENT. As the wedge moves down the incline, the overall free-surface fluctuates. When the wedge enters the water body, the surge waves are in the spread of upstream and downstream. Strong lateral flows converge towards the centerline. The shoreline moves in the landward direction near the centerline and spreads out laterally. The comparison of numerical results and experimental data are very good satisfactory.