大温差地区沥青路面温度应力的累计效应分析  

Analysis of Cumulative Effect of Temperature Stress on Asphalt Pavement in Areas with Large Temperature Differences

作　　者：张万 刘永超 李波[2] ZHANG Wan;LIU Yong-chao;LI Bo(Gansu Province Transportation Construction Group Co.Ltd,Lanzhou 730030,China;School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]甘肃省公路交通建设集团有限公司,兰州市730030 [2]兰州交通大学土木工程学院,兰州市730070

出　　处：《公路》2025年第2期1-7,共7页Highway

基　　金：甘肃省高等学校产业支撑计划项目,项目编号2020C-13;甘肃省交通建设科技项目,项目编号2020-04。

摘　　要：针对河西大温差地区温度循环引发的半刚性沥青路面温度疲劳裂缝问题,利用有限元软件ABAQUS,建立了典型的半刚性沥青路面三维有限元模型,分析其在实际温度场下路面结构的温度应力分布特征,探究了温度应力的主要影响因素,并采用疲劳方程来计算该地区的温度疲劳寿命。结果表明:各结构层的温度应力呈现出规律性变化,在秋季整个面层表现为完全拉应力,春冬季节表现为拉压交替;秋、冬季温差比春季温差对路面的损坏更为严重,且冬季路表最大拉应力达到0.962 MPa,路面极易因受拉而发生开裂;影响路表温度应力的最主要因素为日最大温差、日总太阳辐射和50 cm地温;温度应力作用下疲劳开裂时间较早,与现场调研情况基本吻合。Aiming at the problem of temperature fatigue cracks of semi-rigid asphalt pavement caused by temperature cycling in the large temperature difference area of Hexi,the distribution of transverse cracks in the test section is first investigated,and then a typical three-dimensional finite element model of semi-rigid asphalt pavement is established by using the finite element software ABAQUS,and the temperature stress distribution characteristics of the pavement structure under the actual temperature field are analyzed,and the fatigue equation is used to calculate the temperature fatigue life in the area.The results show that the temperature stress of each structural layer shows a regular change,and the whole surface layer shows complete tensile stress in autumn and alternating tensile pressure in spring and winter.The temperature difference between autumn and winter is more serious than that in spring,and the maximum tensile stress of the road surface in winter reaches 0.962 MPa,and the road surface is easy to crack due to tension.The most important factors affecting the temperature stress of the road surface are the maximum daily temperature difference,the total daily solar radiation and the ground temperature of 50 cm.The fatigue cracking time under temperature stress is quite early,which is basically consistent with the field investigation.

关 键 词：沥青路面 温度应力 大温差 有限元 疲劳开裂 

分 类 号：U416.217[交通运输工程—道路与铁道工程]