Numerical simulation analysis of fatigue failure process of asphalt pavement water damage

asphalt pavement;  water damage;  pore water pressure;  fatigue injury;  Finite element method

Based on Bio seepage consolidation theory, isotropic linear elastic damage theory and fatigue damage theory, a mechanical analysis model of water damage of asphalt pavement is proposed, the axisymmetric finite element method is used to solve the mechanical model, and a finite element program is prepared for numerical simulation analysis. The influence of pore water pressure on the stress state of asphalt pavement and the fatigue damage process of asphalt pavement under the action of vehicle in the presence of pore water were analyzed. The calculation results show that the pore water pressure in the asphalt surface layer is closely related to the permeability coefficient, surface thickness and vehicle driving speed of the surface layer. When the pores of the road surface are saturated with water, under the load, the presence of pore water will lead to the intensification of the stress concentration of the pavement structure, and under the repeated action of the load, it will lead to fatigue cracking and failure, and accelerate the emergence of road surface diseases.