The Mechanism Study Of Protecting Soil Slope By Polyethylene Geonet Along River Highway Under Rainfall Conditions

With the change of global climate and environment,the increase of highway mileage in China,the problem of soil erosion caused by rainfall caused by highway slopes has become more and more prominent.In response to the country’s call for lucid waters and lush mountains are invaluable assets,the research on the ecological protection technology of the soil slope with the geonet as the important body is carried out.First of all,through the relevant literature reading and finishing,the research status of roadside slope soil erosion and geonet protection has a certain understanding.Then carry out on-the-spot investigation on the three sections along the river,statistically analyze the potential disaster-causing factors,compare the occurrence mechanism of typical slope landslides and debris flow accidents,and point out that the main factors affecting soil erosionof soil slopes are soil types,slope angle,protective measures and rainfall conditions.Secondly,by means of the testing of the mechanical properties of materials in different polyethylene geonets,the reasons for the tensile properties and tearing properties of different geonet materials are pointed out.Then through the geotechnical network indoor slope-rainfall simulation test,the grid method is used to qualitatively analyze the soil loss area of the slope which under 36 working conditions during rainfall time;the development slope of the lost area is analyzed.The relationship between various factors on the soil loss area on the slope is pointed out.Then quantitative analysis is carried out on the slope of different slopes,different geonet types and soil loss under different rainfall under the same soil quality,and the influence of various factors on the soil loss of slope is obtained.The analysis of the erosion modulus under the same soil quality shows the overall anti-scour effect under various working conditions,which indicates that the composite blanket material has advantages in application in various soils compared with the other two materials;combined with the US soil loss general formula calibration multi-factor Soil and water loss model of geotechnical net-planted slope under the action;based on the comprehensive influence value method to evaluate the application effect of slopes of different geonets,and provide basis for geonet selection under different soil and different slopes.Finally,with the indoor grass scouring test and the indoor grass direct shear test going by,it is pointed out that the geonet-plant combination can not only reduce the soil erosion of the slope,but also enhance the soil’s shear resistance.Based on the indoor correlation direct shear test data,the ABAQUS slope stability simulation analysis is carried out.Through the study of simulated rainfall under 12 working conditions of the first grade slope,the influence range of slope and geonet on the slope stability is pointed out.By comparing the safety factor and equivalent plastic strain value of the secondary slope under 10 working conditions,it is pointed out that the geonet material has little influence on the overall stability of the slope and has a great influence on the local plastic strain of the slope.