高等级公路沥青路面剪应力分布研究

Distribution Regularities and Influencing Factors of Shear Stress in High Grade Asphalt Pavement Layers

基于线弹性层状体系理论,采用路面结构有限元法,主要探讨高等级公路沥青路面剪应力的分布规律及其影响因素。数据分析结果表明:在各结构层材料性能和厚度允许选择范围内,最大剪应力均分布在距路表3 cm深度范围内;影响剪应力大小的最主要的因素是沥青层模量、泊松比和基层模量。通过计算数据与试验测试抗剪强度对比分析可知:对于普通三层沥青层面层结构,上面层和中面层应进行剪应力验算,且验算时需找到准确的计算点位才能得到各层内最大剪应力值。

Based on the Linear Elastic Multi-layer Theory, using the pavement finite-element program, this article discussed the shear stress distribution regularities and influencing factors in high grade asphalt pavement layers. The results demonstrate that the max shear stress appears in surface to 3cm depth span regardless of the material characteristic and thickness in each layer. The major influencing factors on the shear stress are modulus and Poisson ratio of asphalt layer, modulus of base layer. By comparing the database with testing results, to three asphalt layers pavement structure, it is necessary to check the shear strength in wearing layer and midlayer. When checking, the precious position must be found to calculate the max shear stress in each layer.