Basic Characteristics And Dynamic Simulation Analysis Of Debris Flow In Jinggou Valley,Wubu County

Debris flow hazards in urban construction are attracting the attention of the public,the media and engineering geology.To explore its basic characteristics and dynamic characteristics of the mechanism,has important theoretical significance and practical value.Based on the actual survey data,the state,contact force,velocity and displacement of debris flow are studied by means of theory and technology of mathematics,mechanics and computer.Conclusion:(1)The main characteristics of the debris flow are as follows:?Weibu debris flow in Wubao County is weak,the frequency is low,the scale is large,and the frequency of outbreak is about ten years.?According to the characteristics of debris flow,the watershed is divided into three areas,namely,the formation area,the circulation area and the accumulation area,forming the area"big and slow",the circulation area is"short and narrow"Accumulation area"flat and wide".?The comprehensive analysis shows that the debris flow is 14.5kN/m3,the flow rate is 1.19-4.28m/s,the flow rate is 5.6m3/s-20.61m3/s,the maximum outflow is 0.4×104m3-1.5×104 m3,The total impact of the solid material 0.17×104m3-6.4×104m3;monolithic impact force 22.4 kPa-80.5kPa;the overall impact pressure 11.9kPa-42.8kPa;maximum rush height 0.31m-1.11 m;climb 0.49m-1.78m,the curve of ultra-high 0.43m-1.53m.(2)Proposed the "early to the main gravity erosion,in the late to the main hydraulic erosion"debris flow formation mechanism.Under the condition of rainfall,the slag dam gradually reached the saturation state,under the action of gravity itself,water and solid matter movement,the two confluence after the formation of the initial debris flow.With the persistence of rainfall,the residual solid material and the solid matter in the ditch bed are subjected to hydrodynamic erosion,erosion and erosion,so that the solid matter is continuously involved in the debris flow.In addition to the entrainment of the trending bed,Channel unstable source part of the channel at the same time on both sides of the unstable source of the source is also subject to heavy rain erosion and other ways into the channel,increasing the scale of debris flow.(3)Numerical Simulation of Debris Flow Dynamics by Particle Flow(PFC2D)Numerical Simulation.Based on the debris flow field and dynamic characteristics,the process of the debris flow is simulated and the movement state,contact force,velocity and displacement of the debris flow are reconstructed.Analysis of particles out of the maximum speed,displacement curve.According to the actual situation,the maximum scouring and silting distance of Shougou debris flow can reach 2693m and reach the vicinity of Wubao county kindergarten.