温度-车辆耦合荷载对沥青路面设计参数的影响分析

Numerical Analysis of the Temperature and Load Coupling Effect on Composite Asphalt Pavement

为研究温度与车辆荷载耦合作用下沥青路面的力学响应规律及其对设计参数的影响,建立"大粒径级配沥青碎石柔性基层+水泥乳化沥青混凝土联接层"沥青路面的三维有限元模型,分析其在车轮-夏季最不利温度耦合荷载作用下应变及路表弯沉响应。结果表明,温度荷载对路面面层有显著影响,面层温度应变大于车辆荷载应变,最不利温度应变和车辆耦合应变会超出材料的容许应变,沥青路面设计参数分析应考虑温度效应。

In order to investigate the mechanical response and laws of composite asphalt pavement under the coupling temperature and vehicle loads impact.A three dimensional finite element model of the composite asphalt pavement（large particle size gradation asphalt macadam flexible base ＋ the cold mix cement-emulsified asphalt concrete link layer）was established,and the response of strain and surface deflection under the most unfavorable summer temperature and load coupling effectwas analyzed.The results show that temperature loads for composite asphalt pavement surface layer had a significant impact.The maximum tensile strain of surface layer caused by the environmental temperature was greater than the vehicle load.The most unfavorable temperature strain and coupling strain would exceed its allowable strain,so the temperature effect should be considered in the design parameters of composite asphalt pavement.