饱水沥青路面动力响应的空间分布分析

Spatial Distribution of Dynamic Response for Saturated Asphalt Pavement

水-荷载的耦合作用是沥青路面早期损坏的主要原因之一。首先基于饱和多孔介质理论,建立饱水沥青路面动力响应分析的三维有限元模型,并给出了荷载作用形式、边界条件和材料参数;而后对比分析了动态荷载作用下,饱水沥青路面和无水沥青路面的竖向位移、竖向应力、剪应力和孔隙水压力的空间分布情况。结果表明,与无水状态相比,饱和状态下沥青路面的应力场和位移场都发生了变化,且出现了较大的孔隙水压力的正负逆转,这种孔隙水压力的反复作用将导致集料和沥青粘结的破坏。

The coupled water-loading action is one of the primary factors of initial failure for asphalt pavement.At first,based on saturated porous media theory,the three-dimensional finite element model for transient dynamic analysis on saturated asphalt pavement was built. What＇s more,the loading type,boundary condition and material parameters were listed out. Then,the comparison and analysis of spatial distribution for asphalt pavement between saturated condition and dry （no water） condition were carried out, which included vertical displacement,vertical stress,shear stress and pore pressure. The result indicates that the distribution of stress field and displacement field of asphalt pavement in saturated condition has been changed to be a more adverse situation compared with the dry condition case. At the same time,it also shows that there will be an obvious reversion between positive and negative pore pressure during the loading,which will eventually result in raveling of HMA.