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为了研究沥青路面内的动水压力,基于Biot固结方程,将沥青混合料看作多孔介质,并考虑了它和水体的惯性力及两者之间的耦合作用,对饱水沥青路面进行了快速Lagrange有限差分分析.结果表明,水压的产生和消散在轮载作用过程中同时存在,导致面层内正负水压力及渗透力随时间交替出现,这证实了水损坏过程中的水力反复泵吸作用.动孔隙水压力随车速的增大而增大,而且由于水压力的存在路面弯沉和面层内的有效应力减小,但水对沥青膜的乳化和置换作用加强.动水压力的最大值出现在面层底部,所以建议在面层底部设一排水层,将排水状态由单面排水变为双面排水,有效抑制水损坏的发生.
In order to study the hydrodynamic pressure in asphalt pavement, based on the Biot consolidation equation, the asphalt mixture is considered as a porous medium. Considering the inertial force between the asphalt mixture and the water body and the coupling between them, Fast Lagrange finite difference analysis.The results show that the generation and dissipation of water pressure exist simultaneously in the process of wheel-loading, resulting in the alternation of positive and negative water pressure and seepage force with time in the surface layer, which confirms the hydraulic repetition in water damage Pumping action.Powder pore water pressure increases with the increase of vehicle speed.Because of the existence of water pressure, the deflection of road surface and the effective stress in the surface layer decrease, but the emulsification and displacement of water on asphalt membrane are strengthened. The maximum pressure appears in the bottom of the surface, it is proposed to set a drainage layer at the bottom of the surface layer, the drainage state from single-sided drainage into double-sided drainage, effectively inhibiting the occurrence of water damage.