Numerical Simulation of Dynamic Pore Pressure in Asphalt Pavement
Numerical Simulation of Dynamic Pore Pressure in Asphalt Pavement
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沥青路面动孔隙水压力数值模拟
DOI：
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发表时间：
2009-03
期刊：
影响因子：
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通讯作者：
崔新壮
中科院分区：
文献类型：
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作者：
金青;商庆森;崔新壮
为研究动压力在沥青路面水损害中的驱动作用，基于快速拉格朗日有限差分法和毕奥动力固结理论，将沥青混合料视为多孔介质，对路面进行流固耦合分析。结果表明，动孔压的发展和消散是同时发生的，这使得正、负动孔压和渗透力随时间交替变化。证明了在湿害过程中存在重复的水动力抽吸作用。动孔压随车速的增加而增大。动孔隙水压力的作用降低了路面的有效应力和弯沉。但是，水加速了沥青膜的乳化和置换。最大动孔压出现在面层底部。因此建议设置排水层，将排水条件由单面排水改为双面排水，从而有效限制水分危害。
For studying the driving role of dynamic pressure in water-induced damage of asphalt pavement, based on the fast Lagrangian finite difference method and Biot dynamic consolidation theory, fluid-solid coupling analysis of the pavement is conducted considering asphalt mixtures as porous media. Results reveal that the development and dissipation of the dynamic pore pressure are coinstantaneous and this makes both the positive and negative dynamic pore pressure and seepage force alternate with time. Repetitive hydrodynamic pumping and sucking during moisture damage is proved. The dynamic pore pressure increases with vehicle velocity. Effective stress and deflection of pavement decrease due to the dynamic pore water pressure. However, the emulsification and replacement of the asphalt membrane by water are accelerated. The maximum dynamic pore pressure occurs at the bottom of the surface course. So it is suggested that a drain course should be set up to change the draining condition from single-sided drain to a two-sided drain, and thus moisture damage can be effectively limited.