Analysis Of Rainfall Infiltration Characteristics And Stability Of Layered Soil Slope

Rainfall infiltration is an important factor affecting slope stability,the research object of this paper is the layered soil slope of Poyang Lake Ecological Economic Zone in Jiangxi province,combining with the field investigation,indoor and outdoor tests,model tests and Geo Studio2018 numerical simulation software,four typical rainfall conditions are selected to compare the water-holding response characteristics of each soil layer,slope top,slope shoulder,slope surface,slope foot,slope body and bottom under coupling and uncoupled conditions.Study the stability of layered soil slopes,deformation and failure of slopes and slopes,and strong attenuation laws under four typical rainfall conditions.By assessing the distribution of pore water pressure inside the slope and the change of pore water pressure at each monitoring point,the water-holding characteristics of the layered soil slope under typical rainfall conditions can be obtained.The results show that under four typical rainfall conditions,the preferential infiltration mode of layered soil slope is the same as that of interlaminar interpenetration.Sandy soil with better permeability is the most affected by rainfall,and the clay layer with lower permeability is the least affected by rainfall.Under non-coupled analysis and coupling analysis,the preferential infiltration layer of the layered soil slope is different,but the interlayer seepage law is the same,and the tendency and the layered structure are one of the factors affecting the interlayer penetration law.A comprehensive review of the stability of layered soil slopes under typical rainfall conditions shows that under different rainfall conditions,non-coupling analysis and coupling analysis have different effects on the safety factor of layered soil slopes;the hysteresis of the safety factor in the calculation process is similar to the change trend of pore water pressure.Under the coupling analysis,due to the mutual influence of deformation and seepage,the safety factors of layered soil slopes showed an oscillating attitude and there were differences in the safety factors of layered soil slopes before the end of different rainfall duration.Based on the test of silt,sand and clay in Poyang Lake Ecological Economic Zone in Jiangxi province,observe the deformation and failure of the slope and slope of the layered soil slope,and determine the cross-plate shear strength at selected monitoring points,the initial moisture content and the moisture content after rainfall,the analysis results are as follows:(1)Under the four typical rainfall conditions,the slope of the layered soil slope has obvious damage at the foot of the slope,and the slope slides down as a whole;there is obvious runoff on the slope surface under continuous heavy rainfall conditions and continuous heavy rain conditions;(2)There is a non-linear relationship between the cross plate shear strength and water content of three soils.