Based On Ansys Reinforced Earth Retaining Wall Finite Element Analysis

This study analogied and analysed reinforced earth retaining wall with ANSYS finite element software, and the results of centrifuge model test and theoretical calculation verified the ones of finite element analogy. This study is conducted according to the project of road shoulder type reinforced earth retaining wall located in a certain express road in Xining,Qinghai. The maximum tensile stress of reinforcements with various vertical layout reinforcements interval values, the reinforcement tension strain with various vertical layout reinforcements interval values and various loads, the lateral deformation of the reinforced earth retaining wall with various vertical layout reinforcements interval values and various angles of internal friction of embankment were calculated and analysed with theories and methods of finite elements, so that the latent breaking surface of the reinforced earth retaining wall, reasonable vertical layout reinforcements interval values and the length of reinforcements could be analysed and studied. The results of finite elements method were contrasted with the ones of centrifuge model test. The length of reinforcements was calculated with limit equilibrium theory, and the results were contrasted and analysed with the ones calculated by finite elements theory. The following are the conclusions of the study. First, the latent breaking surface of the reinforced earth retaining wall crosses the top surface near 0.3 multiple of the height of the wall, but it belongs to logarithmic spiral type. Second, the curves of reinforcements tension strain include two peaks, one is near the back of walls, and the other lies in a certain place from the back of walls. The reinforcements tension strain nearly declines to zero over 0.6 multiple but less than 0.7 multiple of wall height from its back, and the length of reinforcements adopts 0.7 multiple of wall height, and it can supply the reinforced earth retaining wall with enough anchor force to make the wall to be stable. Third, the reinforcemnents tension strain and the lateral deformation of wall back reduce gradually with the reduction of vertical layout reinforcements interval value or the increase of the reinforcements layers. The lateral deformation displacement of wall back adds up to 5 multiple or so when the vertical layout reinforcements interval value increases one multiple. The curve of the maximum lateral deformation displacement commences to tend to flat from steepness when the layer of reinforcements is twelve or the vertical layout reinforcements interval value is 0.5 metres. and when the layer of reinforcements is fifteen or the reinforcements interval value is 0.4 metres, the solpe of the curve tends to be zero, which manifests that the vertical layout reinforcements interval value has few effects on the lateral deformation displacement of wall back at that moment and that it is reasonable to adopt 0.4 meters for vertical layout reinforcements interval value. Fourth, with the increase of embankment angle of internal friction, the lateral deformationdisplacement gradually reduces. And the last is that it is conservative to calculate the length of reinforcements for stress analysis method and wedge equilibrium method based on limit equilibrium theory , and it can save quite a lot of reinforcements and make a reduction in construction cost if the length of reinforcements calculated by finite elements method is adopted. Based on what are studied in this article and the problems that the reinforced earth retaining wall has, it is suggested that the length of reinforcements adopts 0.7 multiple of wall height and the vertical layout reinforcements interval value is set to be 0.4 meters, which not only offer enough anchor force to maintain the reinforced earth retaining wall to be stable, but also can save quite a lot of reinforcements and make a reduction in construction cost.