Time history analysis of dynamic response for saturated asphalt pavement

The coupled water-loading action is one of the primary factors of initial failure for asphalt pavement. At first, porous media theory was used to describe asphalt pavement in the environment, whose rationality was also demonstrated. Then, based on saturated porous media theory, transient dynamic analysis of axisymmetric finite element model for saturated asphalt pavement was built, whose corresponding loading condition, boundary condition and material parameters were given at the same time. Finally, the time history variations of vertical displacement, vertical stress, horizontal stress, shear stress and pore pressure for saturated asphalt pavement subjected to dynamic loading were analyzed respectively. The result indicates that the dynamic action of vehicle makes stress field and displacement field within pavement structure have wave characteristics. At the same time, it also shows that there is a reversion between positive and negative pore pressure, which will eventually result in the raveling of asphalt mixture.