Dynamic Response Analysis with 3D Finite Element Method for Two Typical Kinds of Asphalt Concrete Pavements with Saturated Asphalt Layer

The coupled moisture-loading action is the primary factor of initial failure for asphalt concrete pavement.At first,based on the porous media theory,assuming the asphalt concrete as saturated porous media material,two three-dimensional finite element models are established for two typical kinds of asphalt concrete pavements which included the semi-rigid base asphalt concrete pavement,the semi-rigid base asphalt concrete pavement with flexible base.Then the comparison and analysis of the spatial distribution and time change regulation for asphalt concrete pavement between the two kinds of structures are carried out which included vertical stress,vertical strain,and pore pressure.The result indicates that the semi-rigid asphalt concrete pavement stucture with flexible base shows the best performance of resisting the moisture damage,relatively the semi-rigid asphalt pavement structure gives the worse performance.