ABSTRACT

This paper used the finite element method to analyse surface water distribution characteristics on porous asphalt layer under unsaturated seepage, and further compared the critical rainfall intensity of porous asphalt pavements with different design parameters. In this study, the Richards equation was used to describe the unsaturated seepage, and the results were validated with experimental data. The results show that when the water accumulates on the pavement surface, it would firstly emerge at the lowest level of pavement along the longitudinal direction, and then spread along transverse and longitudinal directions. The water depth has no remarkable difference along the longitudinal direction while it differs a lot among different transverse positions. The distribution of surface water depth was analysed and the correlation between the surface water coverage in the transverse direction and the rainfall intensity was established with high R-square values. For pavements with different geometries, the porous layer thickness has the most remarkable effect on the critical rainfall intensity of porous asphalt pavements.

摘要

采用有限元方法分析了非饱和渗流条件下多孔沥青层的地表水分布特征，并进一步比较了不同设计参数下多孔沥青路面的临界降雨强度。本研究采用Richards方程描述非饱和渗流，并用实验数据验证了结果。结果表明，路面积水时，首先沿纵向出现在路面最低层，然后沿横向和纵向扩散。水深沿纵向无显着差异，但不同横向位置差异较大。R平方值。对于不同几何形状的路面，多孔层厚度对多孔沥青路面临界降雨强度的影响最为显着。