关键词: 道路工程, 沥青路面, 水损坏, 动孔隙水压力, 渗透力

Abstract: Based on fast Lagrangian finite difference method and the Biot consolidation theory considering the inertia force of asphalt concrete and water, a dynamic coupled fluidsolid analysis of the pavement was put forth with asphalt mixtures as porous medium for studying the dynamic water pressure in asphalt pavement. The results show that the development and dissipation of dynamic pore water pressure are coinstantaneous, which makes the plus and minus pore water pressure and seepage force both alternate with time. The process of repetitive hydrodynamic pumping and sucking during waterinduced damage was proved. The dynamic pore water pressure increases with vehicle velocity increase. The effective stress and the deflection of pavement all decrease due to dynamic pore water pressure. However, the emulsification and replacement of the asphalt membrane is accelerated by water. The maximum dynamic pore water pressure occurs at the bottom of the surface layer, which suggesting that a drain layer should be set up to change the drainage condition from a singlesided drain to a twosided drain, and the waterinduced damage can be decelerated effectively.

Key words: road engineering, asphalt pavement, waterinduced damage, dynamic pore water pressure, seepage force