Dynamic response of asphalt pavement considering coupling between fluid flow and stress under moving vehicle loads

The water-load coupling action is one of the primary factors for initial failure of asphalt pavement. Using the finite element numerical analysis software ABAQUS,based on elastic-plastic material hypothesis,the 3D finite element model of asphalt pavement with coupling between fluid flow and stress in the case of rainfall infiltration was established.Loading type,boundary conditions and material parameters were given. Then,the numerical simulation under uniform vertical moving loads was performed,the comparison and analysis for spatial distributions of several important parameters including 3D stress,vertical displacement and pore water pressure of asphalt pavement under the coupled condition and the dry condition were conducted. The results indicated that under fluid flow-stress coupled condition,the dynamic response of 3D stress in structural layers of asphalt pavement is quite different from that under dry condition,the exerted force status of asphalt pavement is worse and easy to cause structural damages.