Engineering behaviors of geogrid reinforced earth retaining wall of flexible surface

Based on the laboratory test,engineering behaviors of geogrid reinforced earth retaining wall were studied.Lateral and vertical earth pressure,deformation of reinforcement and wall face were tested.The distributions of vertical and lateral earth pressure,the strain of reinforcement and the lateral deformation behavior of wall face were analyzed.The results show that lateral earth pressure distributes non-linearly along wall back.Lateral earth pressure in each layer increases linearly with the increase of the imposed load,but the increasing rate is smaller than that of the theoretical value.Cycles of load and unload make residual lateral earth pressure increase.Vertical earth pressure shows uniform distribution along reinforcement,and it is smaller than theoretical value in the first layer of retaining wall.With the increase of imposed load,the distribution of strain along the reinforcement changes,and the reinforcement can meet strength requirement under test load.The potential failure surface of retaining wall determined by generalized Coulomb theory is quite consistent with the position of maximum strain of reinforcements.The maximum lateral deformation of wall face occurs in the third layer and the fourth layer of retaining wall,which leads to bulging phenomenon in the middle of wall face.