刘凯　徐晓美　张磊　张小惠

摘要：相关研究表明，在进行半刚性沥青路面动力响应研究时，静载模式已经不能解释动态荷载作用下路面结构产生的各种现象，因此亟需开展动态荷载作用下半刚性沥青路面的动力响应研究。本研究首先根据道路参数，运用ABAQUS软件建立沥青路面与路基的三维动力分析模型，研究在ABAQUS中移动恒载及半波正弦荷载的加载实现方式。然后基于所编写的加载程序，研究半波正弦荷载与移动恒载作用下半刚性沥青路面各层的动力响应情况。最后，针对受力情况较为严重的沥青面层，研究不同车速下沥青面层的动力响应。分析结果表明：在动态荷载作用下，半刚性基层的水平方向及垂直方向动力响应明显，各面层之间的各向应力都较大;随着车速的增加，路面的各向应力呈现减小趋势。

关键词：动态载荷;半刚性沥青路面;动力响应;有限元分析

中图分类号：U416.01文献标识码：A文章编号：1006-8023（2019）02-0082-05

Research on Dynamic Response of Semi-rigid Asphalt Pavement under Dynamic Load

LIU Kai， XU Xiaomei， ZHANG Lei， ZHANG Xiaohui

（College of Automobile and Traffic Engineering， Nanjing Forestry University， Nanjing 210037）

Abstract：Research results show that the static load mode cannot be used to explain the various phenomena generated by the pavement structure under dynamic loading while studying the dynamic response of semi-rigid asphalt pavement. Therefore， the study on dynamic response of semi-rigid asphalt pavement under dynamic loading urgently needs to be performed. Firstly， based on the road parameters， the three-dimensional dynamic analysis models of asphalt pavement and subgrade were established by using ABAQUS software. The implementation of load for moving constant load and half-wave sinusoidal load in ABAQUS was studied. Then， based on the loading program， the dynamic response of each layer of semi-rigid asphalt pavement under half-wave sinusoidal load and moving constant load were studied. Finally， the dynamic response of the asphalt surface layer at different speeds was studied with serious stress. Analysis results show that under the dynamic load， the dynamic response of the semi-rigid base layer is obvious in the horizontal direction and the vertical direction. Stress between the layers is large in various directions. With increasing of vehicle speed， the lateral stress of the road surface will decrease.

Keywords：Dynamic load; semi-rigid asphalt pavement; dynamic response; finite element analysis

0引言

目前将车辆荷载视为静荷载，路面结构视为弹性体系结构的设计方法在沥青路面设计中应用十分普遍 [1-2]。但随着高速公路运输高速重载化的发展，在行驶过程中，会加快道路破坏，严重影响道路的使用寿命，静载模式已经不能解释动态荷载作用下路面结构产生的各种现象 [3-4]。因此，研究动态荷载作用下半刚性沥青路面动力响应具有十分重要的意义。Jianmin Wu等 [5]利用ABAQUS建立三维有限元模型，分析了混凝土路面结构在移动荷载作用下的沥青隔震层的动力响应，并通过改变隔震层厚度、模量、隔震层与混凝土板的组合方式计算了临界位置处的应力和挠度。……