Cumulative Plastic Deformation for Improved Soil Subgrade under Cyclic Loadings

Abstract

Based on an improved dynamic model, a method is proposed to predict the cumulative plastic deformation for improved weathered granite subgrade under long-term cyclic loadings. The formulas for parameter quantification in the method are derived by regression of repeated load triaxial test results. To determine the deviator stresses used in the method, a fully non-linear simulation model of an improved weathered granite subgrade in Wu-Guang PDR is developed by employing Lagrangian difference method and free-field boundaries. The settlements of the improved soil subgrade are predicted and analyzed. The applicability of the proposed method is verified by comparisons between predicted and field test results.