Study On The Law Of Debris Flow And Its Disaster Prediction In Super-high Dump

Ultra-high drainage field is a giant artificial loose pile body,mainly used for centralized discharge of surface waste,once encountered heavy rain and then cause debris flow,the outbreak of rapid,serious consequences,to the downstream caused great life and property damage.Based on the similarity theory,the influence of the height of the dump,the concentration of the debris,and the characteristics of the downstream gully(slope and curvature)on the law of the heavy mud and debris flow in the high dump are studied in detail.The numerical simulation of the downstream flow of debris flow in ultrahigh drainage field is carried out by using large-scale three-dimensional numerical fluid software CFX.Get the following main conclusions:(1)When the height of the dump is increased,the depth of the mud at the same section is deeper and the velocity is faster.With the increase of the debris flow concentration,the viscosity increases and the velocity of the debris flow decreases.At the same time,due to the increase of the viscosity of the debris flow,the fluctuation of the debris flow is weakened,and the transition in the process of debris flow is reduced and decreased.(2)The maximum mud depth hmax of the debris flow in the fixed section of the downstream valley is most significant,and the influence of the debris flow concentration and the downstream valley longitudinal slope and the curvature is small.For the maximum flow velocity u,the debris flow concentration has the most significant effect.(3)The CFX software has a great influence on the law of debris flow movement.In the zodiac zone,the mountain has played a role in blocking the flow of debris flow.The debris flow flows into the mountain after the flow,and the eddy current On the other hand,the CFX numerical simulation software post-processing module is used to process the numerical simulation results.The dynamic motion images are simulated to simulate the debris flow in the actual terrain.On the basis of the actual terrain,the velocity and impact force are analyzed,The change curve has a great influence on the location of the survey site,and provides some guidance for the disaster prediction work.