Research On The Effect And Mechanism Of Soil Erosion Resistance Of Compound Microtopography On Slope

Soil erosion is an important limiting factor for China's natural environment and economic development.The process of slope erosion is an important part of soil erosion research,and the situation of soil erosion in mining areas is particularly serious.At present,the slope management method in the mining area is relatively simple,and one-sided slope management is still widely adopted,which results in serious soil erosion in the mining area and easily causes disasters such as debris flow and landslides.Terrain remodeling and soil reconstruction are basic projects for land reclamation and ecological reconstruction.The change of landform directly affects the ground material flow and energy conversion,and determines the stability of slope utilization after reclamation and the advantages and disadvantages of subsequent vegetation restoration site conditions.Based on this,referring to the common farming methods of sloping land in agricultural production,straight slope-nest microtopography,straight slope-continuous soil trough microtopography,straight slope-soil surface micro-landforms(control group)were designed to conduct artificial rainfall tests in the field,and the water retention index and stability index were selected to analyze the anti-corrosion effect of the composite microtopography on the slope.The ABAQUS finite element software is used to build a fluid-solid coupling model,and related parameters are set according to the previous physical properties of the soil on the slope,and simulate and analyze the laminar erosion and slope seepage erosion process of the composite micro-landform on the slope,and clarify the anti-corrosive action mechanism after the concave landform is laid out.According to the analysis of water holding test data,compared with the straight slope-soil surface microtopography group(control group),the layout of the other two sets of concave composite microtopography effectively reduced the runoff and sediment yield on the slope surface.The depression volume and soil infiltration rate of the straight slope-nest microtopography group and straight slope-continuous soil trough microtopography group are better than the straight slope-soil surface microtopography.In the long run,the long-term moisture content of the slope soil after rainfall varies from top to bottom,middle to bottom,and bottom.The average water content of soil in the straight slope-nest microtopography group and straight slope-continuous soil trough microtopography group was larger than that in the straight slope-soil surface microtopography group.Among them,the average value of microtopography of straight slope-continuous soil trough is the highest.The layout ofthe concave composite micro-landscape improves the soil water holding capacity of the slope to a certain extent,and plays a certain effect of water storage and soil conservation.According to the 3D laser microtopography scans obtained before and after rainfall,and the analysis of the extracted stability test data,it can be seen that the 10 selected terrain factors have significant correlations,which comprehensively express the slope microtopography information.Compared with the straight slope-soil surface microtopography group(control group),after rainfall,the light and heat resources on the slope surface of the straight slope-nest microtopography group and straight slope-continuous soil trough microtopography group are more balanced,the degree of surface distortion is low,and the degree of erosion is also significantly lower than that of the control group.The layout of the concave landform significantly improves the stability of the slope.According to the software simulation analysis,the simulation results of the ABAQUS finite element analysis software are consistent with the field test results.The surface laminar flow of the three groups of composite micro-landforms occurred first in the middle of the slope.The surface laminar erosion range of the concave geomorphic group has been reduced.The slope saturation of the straight slope-nest microtopography group and slope-continuous soil trough micro-topography group are slightly higher than those of the slope-soil micro-topography group,which improves the pore pressure,displacement,and saturation of the slope seepage.It also improved the capacity of the slope to store and hold water.Compared with the straight slope-soil surface microtopography group,the layout of the straight slope-continuous soil trough microtopography and straight slope-soil nest microtopography group has significant effects,which slows down the erosion process of the slope and the degree of soil erosion.