Debris Flow Force Parameters And Impact Force Along Landslide Research On Evolution Mechanism

The accumulation form of landslide debris flow determines its hazard range,the velocity of landslide debris flow affects its hazard intensity,and the impact force of landslide debris flow determines its damage intensity to mountain buildings.Studying the dynamic parameters of the landslide debris flow and the evolution trend of the impact force along the process under different working conditions can provide a reference for the disaster prevention and mitigation of mountain buildings and engineering practice.On the basis of literature research and filed investigation of landslide occurrence sites,by carrying out indoor model experiments and numerical simulations,the dynamic parameters of the landslide debris flow and the evolution of the impact force along the process are studied,and the gradient and gradation paired with the dynamic parameters of the landslide debris flow and the impact force are analyzed.The influence of the evolution characteristics of the force along the process,revealing the influence of the initial grain order arrangement in the source area on the dynamic parameters of the debris flow and the impact force,restoring the Sanxi Village landslide in the numerical simulation,and studying the dynamic parameters of the Sanxi Village landslide and the evolution of the impact force along the process.1)In the laboratory model experiment,the leading edge velocity of the landslide debris flow is affected by the shape of the slope toe,and the blocking effect at the toe of the slope will lead to discontinuous energy transfer between the landslide debris flow and change the original particle gradation characteristics,and finally the velocity of the leading edge of the landslide debris flow fluctuates during the deceleration stage;in terms of impact force,the particle size has a great influence on the evolution of the impact force of the debris flow.2)Under different particle order distribution conditions,the initial particle order distribution of the debris flow in the sliding source area is an important factor affecting the particle sorting degree of the debris flow along the thickness direction and along the movement path,and the velocity of the debris flow front Affected by the initial particle size distribution,the closer a certain debris flow particle is to the upper layer,the greater the peak velocity of the debris flow particle and the shorter the time to reach the peak velocity,the larger the particle size of the debris flow particle,and the larger the debris flow front velocity larger;the impact force of the debris flow is affected by the particle size and the distribution of the initial particle order,the impact force of the large particles is large and the contribution rate to the total impact force is high,and the impact force of the particles with the initial order distribution in the upper layer is larger.3)In the numerical simulation of Sanxi Village,the deflection terrain affects the movement of the landslide,and the speed of each part of the front edge of the landslide varies.In the rapid deceleration stage,the acceleration of the left rock and soil mass is the largest,and the particle size affects the evolution of the velocity of the front edge of the landslide debris flow.Through the study of the impact force,it is found that the landslide impact on the house is mainly divided into three stages,namely the stage of sharp increase of the impact force,the stage of the decline of the impact force and the quasi-static accumulation stage,in which the particle size of the landslide debris flow restricts the development of the peak impact force.The evolution of the impact force of the debris flow is different along the process.When it is close to the slip source area,the peak impact force varies greatly with distance,while when it is far away from the slip source area,the peak impact force varies less with distance.