An Anisotropic Model of Unbound Granular Material Under Repeated Loading

The base and subbase layers of a pavement are compacted to the desired density by rollers. This cause the anisotropy in other words the layer more steer in the vertical direction than the horizontal direction. In the study inherent and stress induced anisotropy were measured by using the repeated load triaxial test equipment which is able to cycle both confining and axial pressure. The test results were then modelled using the stepwise regression. A new cross anisotropic model was proposed to predict the unbound stress-strain behavior. The proposed model is able to predict the axial strain more accurately than the radial strain.