层间接触对半刚性沥青路面力学性能的影响

Influence of Interlayer Contact on the Mechanics Behavior of Semi-Rigid Asphalt Pavement

基于典型的多层弹性层状体系,将沥青路面结构分为上面层、中面层、下面层、半刚性基层和土基层。考虑各结构层层间的接触,利用有限元软件ABAQUS,建立了三维有限元接触模型,并与连续模型进行了对比分析。给出了两种不同有限元模型在车辆荷载下的路面弯沉值,沥青面层底面和半刚性基层底面的最大主应力,土基顶部的最小主应变,结构层中的最大剪应力等。结果表明:基于连续模型的半刚性路面厚度设计值偏小,导致在使用初期路面就容易出现各种损坏,而接触模型比较符合路面的实际工作状况,进行半刚性路面厚度设计时采用接触模型应该更加合理、准确。

Based on the typical muhilayer elastic layered system, the asphalt pavement structure was divided into top surface layer, middle surface layer, bottom surface layer, semi-rigid base and soil base. Considering the contact between layers of the structure, a three dimensional finite element interlayer-contact model was established and the contrast analysis with the interlayer-continuous model was conducted by ABAQUS. In two different finite element models, the deflection values of the pavement with the vehicle load, the max principal stress of asphalt surface and semi-rigid base, the min principal strain of top soil base and the max shearing stress of the structure layer were presented. The results show that the designed value for the thickness of semi-rigid pavement based on interlayer-continuous model is small. It causes damages in the early operation stage of asphalt pavement. And the interlayer-contact model is in line with the real working state of the pavement layer bet- ter. The interlayer-continuous model is suggested to use in the designing of thickness for semi-rigid pavement.