Study On The Spoil Accumulation Of City Suburb Slope Stability

In order to study the slope stability of spoil accumulation in rainfall conditions and to predict soil and water loss of loose deposit.This paper takes the loose deposit from ShaYang Road as the research object,has carried on the field investigation,and determination of its physical and mechanical properties;By simulated rainfall experiment,the simulation under the condition of rainfall the slope erosion process,analyzes the loose deposit erosion resistance;The terrain factor and the slope size of the loose deposit are obtained by using the FARO three-dimensional laser scanner.On this basis,the soil and water loss of the loose deposit is calculated by using the high precision DEM.Using the finite element software of ABAQUS to establish model,the paper analyzes the loose deposit under the condition of rainfall infiltration of slope stability.The following conclusions:(1)Through the physical mechanics test,it is concluded that the loose bulk density is low,the structure is poor and the erosion resistance is poor.(2)Through the simulated rainfall experiment,the results show that the runoff time,the average runoff rate,the average erosion rate,the average runoff sediment concentration and the rainfall intensity are correlated with the simulated rainfall,and runoff rate,runoff sediment concentration,erosion rate with rainfall duration.(3)Using the three-dimensional laser scanning technique,the slope characteristics and terrain factors of the deposited body can be extracted,and the high precision DEM can be established to calculate the soil and water loss of the loose deposit.(4)Through the analysis of the finite element software ABAQUS,accurately simulates the effect of rainfall on deposit inside the influence law of transient seepage field,slope obtained under different rainfall intensity and rainfall duration,rainfall type and permeability coefficient under the condition of slope internal change law of pore water pressure,and further to simulate the fluid-structure interaction phenomenon.(5)Through the simulation of finite element software ABAQUS,the loose deposit of ShaYang Road,Under the condition of the heavy rain,the safety factor gradually decrease over time and even landslide along the surface.