Research On Experiment And Numerical Analysis Of High Reinforced Earth Retaining Wall

As a reinforcing material,the geosynthetics is widely used in engineering practice tostrengthen the foundation,slope,road,etc..However, the study on the reinforcement mechanismand the relevant design theory are much backward relative to the engineering application.As aresult,the development of reinforcement technology was interfered.The paper puts highreinforced earth retaining wall of Shennongjia Airport I slope as the main object of study, delvesinto the interface characteristics of gravel soil and geogrid by pull-out test; And through Plaxis tobuild the high reinforced earth retaining wall numerical model of Shennongjia Airport I slope fordifferent wall construction stage analysis.The major conclusions show as follows:1) A pull-out test on the behaviors at interface between geogrids HDPE130,HDPE170andgravel soil,the deformation and geogrids’ translational process of geogrids under different upperload and drawing displacement are analyzed;the progressive development and nonuniformchange processes of frictional resistance, the change rule of pseudo friction coefficient underdifferent upper load, and leading role of the residual coefficient of friction under high upper loadare studied;2) Assuming that the soil is an ideal Mohr-Coulomb elastic-plastic model, the stress-straindistribution of retaining wall under different stages is simulated through Plaxis, a Finite ElementMethod analysis software; the location of potential sliding surface and the safety factor ofretaining wall is analyzed with strength reduction method; three kinds of failure mode ofreinforced earth retaining wall is analyzed. It could be found out that the sliding surface of theinterior reinforced earth starts from the foot of the slope; as for the exterior reinforced earth, theretaining wall acts as a whole and the sliding surface satisfies the Rankine’s earth pressure theory.3) According to the horizontal displacement distribution on different fracture surface of bothunreinforced and reinforced earth in high reinforced earth retaining wall and the maximumvertical displacement distribution of retaining wall, it could be inferred that the strain of soil could be decreased by reinforcement, leading to the shear stress concentration on the connectingsurface of reinforced earth and unreinforced earth.4) Numerical model based on the traditional Mohr-Coulomb criterion,the numericalcalculation results is generally greater than the actual observation data,it shows that the Mohr-Coulomb criterion does not completely accurate response characteristics of the reinforcedsoil.Therefore, Mohr-Coulomb criterion is used to calculate reinforced wall with somelimitations.