Study On Deformation And Stability Of Geogrid Reinforced Embankment

Geogrid-reinforced slopes are widely used in soft foundation treatment,old road reconstruction and expansion embankment widening,subgrade filling and excavation joints,and embankment slope reinforcement.The principle of the reinforcement method is to set high tensile strength in the soil.Through the interaction between the reinforcement and the soil,the stress and strain of the soil are constrained,so that the overall mechanical properties of the soil are improved and the overall strength is enhanced.This paper will further study the law of reinforced embankment and analyze the factors affecting the deformation and stability of reinforced embankment,so as to provide certain theoretical support for the reasonable setting of reinforced embankment.Based on the Qixian-Lishi Expressway Project in Shanxi Province,this paper analyzes the reinforcement mechanism of the geogrid and the stability of the embankment in combination with relevant data.At the same time,the ABAQUS finite element software is used to establish a slope model,which is designed for different conditions.The deformation and stability of the reinforced embankment are analyzed and studied.The main research contents and results are as follows:(1)By consulting related literature,analyze the reinforcement mechanism of the geogrid,the internal force failure mechanism,the failure mode of the reinforced soil embankment slope and the calculation method of the reinforced soil embankment slope stability.(2)Conduct theoretical research on linear elastic model and elastoplastic model;according to the existing knowledge system and related literature,make an in-depth analysis of the basic principles and failure criteria of the strength reduction method used in the calculation of simulated slopes.(3)Using ABAQUS software,the embankment slope model was established for numerical simulation analysis.Through comparative analysis of the deformation of reinforced and unreinforced embankment slopes under traffic load,it was verified that the geogrid reinforced embankment slope has higher stability.The research results show that the use of reinforcement can reduce the critical depth of the impact of traffic load on the foundation;when the number of loads is small,the effect of the grid is not fully reflected,and the horizontal displacement of the top surface of the embankment is the same when reinforced and unreinforced.Large;but after repeated actions,the difference between reinforced and unreinforced becomes larger.(4)Through the establishment of multiple models,the calculation results of different reinforcement lengths,different reinforcement intervals,different reinforcement modulus and embankment slopes under different slope ratios are studied.In this way,the effect of four variables on the stability of embankment slope is obtained.The results show that all four variables have an impact on the stability of the slope.The greater the reinforced length and the modulus of the rib,the greater the stability.The smaller the reinforced spacing,the higher the stability,and the more stable the slope ratio,the better the stability.