移动荷载作用下渗流-应力耦合沥青路面动力响应

摘要

The water-load coupling action is one of the primary factors for initial failure of asphalt pavement.Using the finite element numerical analysis software ABAQUS,based on elastic-plastic material hypothesis,the 3D finite element model of asphalt pavement with coupling between fluid flow and stress in the case of rainfall infiltration was established. Loading type,boundary conditions and material parameters were given.Then,the numerical simulation under uniform vertical moving loads was performed,the comparison and analysis for spatial distributions of several important parameters including 3D stress,vertical displacement and pore water pressure of asphalt pavement under the coupled condition and the dry condition were conducted.The results indicated that under fluid flow-stress coupled condition,the dynamic response of 3D stress in structural layers of asphalt pavement is quite different from that under dry condition,the exerted force status of asphalt pavement is worse and easy to cause structural damages.%水与荷载的耦合作用是沥青路面早期破坏的主要原因之一。采用有限元数值分析方法，在弹塑性假设下利用 ABAQUS 软件，建立降雨入渗条件下的渗流-应力耦合沥青路面三维有限元模型，给出了材料参数、边界条件和荷载作用形式，实现了均布竖向移动荷载作用下的数值模拟，得到了耦合作用下沥青路面三向应力、竖向沉降、孔隙水压力等的空间分布情况，并与无水状态下应力场模型进行了对比分析，结果表明，渗流-应力耦合作用下，沥青路面各结构层内三向应力动力响应特性较无水状态时不同，使得沥青路面受力状态不利从而更易产生结构性损坏。