考虑层间状态的横观各向同性沥青路面力学分析  

Mechanical analysis of cross-isotropic asphalt pavement considering the interlayer conditions

作　　者：朱向平 颜可珍[2] 张虎 游凌云[2] ZHU Xiang-ping;YAN Ke-zhen;ZHANG Hu;YOU Ling-yun(Hunan Prospecting Designing & Research General Institute for Agriculture Forestry & Industry, Changsha 410007, China;College of Civil Engineering, Hunan University, Changsha 410082, China)

机构地区：[1]湖南省农林工业勘察设计研究总院,湖南长沙410007 [2]湖南大学土木工程学院,湖南长沙410082

出　　处：《广西大学学报（自然科学版）》2020年第4期748-756,共9页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金项目(50808077,51278188)。

摘　　要：沥青路面层间粘结状况的好坏对路面结构的力学响应具有较大影响。利用有限元软件ANSYS,将沥青混合料考虑为横观各向同性材料,计算了沥青路面在不同温度场与车辆荷载等作用下的关键力学指标响应,分析了层间接触状态和面层沥青混合料水平与竖向模量比对路面结构的力学响应影响规律。研究结果表明,利用接触模型计算出的关键力学指标比连续模型要大,尤其接触条件不好时更为显著。接触状况对沥青层层底拉应力、拉应变的影响比较明显,而路表弯沉、面层内最大剪应力对层间接触状态的变化则不太敏感,面层模量比越小,面层结构层强度就越低,在接触状态不好时容易导致面层承载能力不足。研究成果为科学的解释沥青路面在不同环境温度与车辆荷载综合作用下的破损特征与行为机理提供了理论依据,对进行沥青路面寿命预估和路面性能评价提供了帮助。The interlayer conditions have great influence on the mechanical response of pavement.Under the assumption that asphalt mixtures were cross-isotropic,the crucial mechanical responses of asphalt pavement were calculated on the basis of different vehicle loads and temperature fields by using the finite element software ANSYS;the effects of the interlayer conditions and the ratios of modulus in horizontal and vertical directions of asphalt mixture on the mechanical responses were analyzed.The results show that the mechanical responses calculated by using contact model are greater than these calculated by using continuous model,especially when the interlayer condition was worse.The interlayer conditions have profound effects on the tensile stress and strain at the bottom of asphalt layer,but rarely affect the surface deflection and maximum shear stress in asphalt course;the smaller the ratios of modulus of asphalt course,the lower the strength of surface course structure,which may well result in the deficiencies of bearing capacity of pavement structure when the interlayer conditions is worse.The research results provide a theoretical basis for explaining the damage characteristics and behavior mechanism of asphalt pavement under the different temperature and vehicle load conditions,and it provides guidance for pavement life prediction and performance evaluation.

关 键 词：道路工程 沥青路面 有限元 横观各向同性 层间接触 温度梯度 

分 类 号：U414[交通运输工程—道路与铁道工程]