Analysis of permanent deformations in granular materials of road structures

Abstract

Models of permanent deformation in soils and granular materials are analysed in the article. Power, logarithmic and exponential functions that connect permanent deformation with the deformation caused by the first loading or with the one accumulated as a result of a certain number of load applications are found to be most often used. Due to the application of a hereditary creep theory some generalizing models for the analysis of permanent deformations under cyclic loading were obtained. As a result, a new method based on the integration of power functions describing the increment of permanent deformation was proposed. The experimental data on the dependence of residual deformation upon the amount of loads, maximum and minimum stresses were obtained, coefficients of equations derived were defined. The results of the calculations and the experimental data of a triaxial test of sand-gravel mix and granodiorite crushed stone were compared.