Parametric Analysis on Geosynthetic Reinforced Retaining Wall

Abstract

Abstract The types of backfills to be used in the wall were determined by granulometry and plasticity properties given by FHWA. Using these backfills and geogrid reinforcement, wall lengths were calculated. It is stated in FHWA that wall length should be minimum 0.7H. Using the calculated reinforcement lengths, changes in the factor of safety were examined by designing with the Geo5 program for different backfills. İn the Case of wall length is fixed at 0.7H, the effects of change of backfill types on the factor of safety were investigated by geo5 and plaxis programs. Finally, the effect of change in strength parameters of backfills on stability was determined by the plaxis program. As a result of analysis; all calculated L/H ratios were below 0.7. In case the reinforcement spacing is calculated, the presence of cohesion caused a decrease in L/H ratios. As the stiffness of backfill increases, the calculated L/H ratios decreased. As a result of this decreased, the factor of safety decreased and the backfills did not have a significant effect. The factor of safety obtained with plaxis were lower than obtained with geo5. Cohesion and internal friction angle have a positive effect on the factor of safety and deformations.