三维沥青路面多层体系的黏弹性力学分析

Viscoelastic mechanical analysis of three-dimensional asphalt pavement multi-layer system

基于改进的无单元Galerkin方法(Improved Element-Free Galerkin,简称IEFG),建立了三维沥青路面多层体系的黏弹性力学模型。对交通荷载作用下沥青混凝土路面的位移及应力进行了计算,分析了不同的节点数及影响域比例参数对计算结果的影响,得到了沥青路面多层体系计算模型的合适节点数目和影响域比例参数的选择范围。同时,分析了中面层厚度对路面抗车辙性能的影响。结果表明:改进的无单元Galerkin方法在分析沥青路面黏弹性方面是有效的;节点数在1800以上、影响域比例参数在1.8~1.9之间取值时计算结果较好;中面层厚度越小,沥青路面车辙变形越大。本文结果可为沥青路面设计提供参考。

Based on the improved element-free Galerkin(IEFG)method,the viscoelastic mechanical model of a three-dimensional asphalt pavement multi-layer system is established.The displacement and stress of asphalt concrete pavement under traffic load are calculated.Influences of different number of nodes and proportional parameters of the influence domain on the numerical results are analyzed.The appropriate number of nodes and the selection range of the proportional parameters of the influence domain are obtained for the calculation model of asphalt pavement multi-layer system.Influence of the thickness of the middle surface layer on the rutting resistance of the pavement is also analyzed.Results show that the IEFG method is effective for analyzing the viscoelasticity of multi-layer asphalt pavement.Numerical results are better when the number of nodes is more than 1800 and the proportional parameters of the influence domain are between 1.8 and 1.9,and the smaller the thickness of middle surface layer is,the greater the deformation of the asphalt pavement will be.The research results in this paper can provide reference for the design of asphalt pavement.