基于力学分析的透水沥青路面结构设计

Structure Design of Permeable Asphalt Pavement Based on Mechanical Analysis

基于国内常用的透水路面结构形式,采用BISAR软件建立模型,分析各结构层厚度和模量对路面结构的路表弯沉、土基顶面的压应变、OGFC层底拉应力和ATPB层底拉应力的影响,分析结果表明:在透水路面采用增加结构层厚度来提高透水性能的策略中,增大面层厚度对路面结构整体是有益的,但增加基层厚度对路面结构受力不仅无益,反而有害。路面结构长期被水浸泡后,结构层的模量会降低,这对路面结构整体受力不利,尤其是上面层模量的降低。因此,在透水路面材料设计中,在满足透水性能要求的前提下,应优化上面层材料的级配组成设计,提高混合料的模量。

Based on the commonly used permeable asphalt pavement structure,the surface deflection,compression strain on the top of subgrade, tensile stress at the bottom of OGFC layer and ATPB layer were calculated by BISAR to analyze how structure thickness and modulus affect them. The result shown that increasing the,thickness of surface layer improved the permeable performance of pavement,but increasing the thickness of base course led to the opposite effect.When the pavement structure soaks in the water,the modulus of the structure will decrease,it had a nagetive effect on the pavement structure bear load especially the decreased of the top surface course modulus.Therefore increasing the modulus of the top surface course by optimizing the gradation design was necessary under the premise of good water permeability.