RESEARCH ON THE INFLUENCE FACTORS OF FLOW AND DEPOSITION OF DEBRIS FLOW BASED ON THE FLO-2D SIMULATION

Debris flow is different from the common landslide. It is a kind of temporary water with sand and stones occurred in a mountainous area. As researches shown, the debris flow is characterized with the nature of Bingham Body and moving jams. Many scholars had made many researches of numerical simulation method, which based on rheology experiment and model. And compared the scope, movement speed and movement time of the debris flow with the actual situation, the numerical simulation programs were developed for the forecast of debris flow. The FLO-2D is one of the software. As engineering practice proved, movement and sedimentary characteristics of debris flow is very important for further study based on the flow characteristics of research on debris flow substance composition. In order to analyze the relationship between debris flow movement-accumulation characteristics and viscosity-yield stress, we simulated the moving characteristics of debris flow by FLO-2D model. Through the analysis, we conclude that debris flow velocity is reduced with the increase of the viscosity, and the reduction is nonlinear. With the increase of yield stress, that is one of the impact factors about debris flow occurrence and stop, flow depth increases. But among the debris flow movement characteristics, the effect between yield stress and debris flow velocity is not obvious. With the increase of the viscosity, the impact force of debris flow decreases. Meanwhile, with the increase of the yield stress, the impact force of debris flow is increased.