沥青路面实测面层层底横向水平应变响应分析  

Analysis on Measured Surface Course Bottom Lateral Horizontal Strain Response for Asphalt Pavement

作　　者：潘勤学[1] 胡嘉 张建 孙杰[3] 谌旎偲 PAN Qin-xue;HU Jia;ZHANG Jian;SUN Jie;CHEN Ni-cai(School of Traffic&Transportation Engineering,Changsha University of Science&Technology,Changsha,Hunan 410114,China;Jinan City Construction Group Co.,Ltd.,Jinan,Shandong 250014,China;Jinan Urban Construction Group Co.,Ltd.,Jinan,Shandong 250031,China;School of Civil Engineering,Changsha University,Changsha,Hunan 410022,China)

机构地区：[1]长沙理工大学交通运输工程学院,湖南长沙410114 [2]济南城市建设集团有限公司,山东济南250014 [3]济南城建集团有限公司,山东济南250031 [4]长沙学院土木工程学院,湖南长沙410022

出　　处：《公路交通科技》2024年第10期82-89,共8页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(52378441,51908071);国家重点研发计划项目(2023YFB2603500);湖南省自然科学基金项目(2024JJ5037,2020JJ5579);湖南省交通运输厅科技进步与创新计划项目(202107);长沙市科技计划项目(kc1809034)。

摘　　要：为了揭示沥青路面应变响应的变化规律,通过现场埋设光纤光栅应变及温度传感器,对半刚性基层沥青路面结构开展了不同温度下承载板竖向变形及沥青面层横向应变的同步测试研究,构建了承载板各级荷载下的路表竖向变形与中面层层底横向应变的量化关系模型;进而建立了横向应变随温度和行车速度变化的量化关系模型。结果表明:动、静载作用下沥青中面层横向水平应变均有明显的黏弹塑特性,横向静应变历时曲线特征与Burgers模型吻合,横向动应变历时曲线呈现压拉波形,横向动、静应变值均随路表温度的增加而非线性增加,且应变增加幅度随温度的升高而逐渐减小,二者与温度均呈良好的单对数相关关系,据此得到了实测应变的温度修正系数计算公式;沥青中面层层底的横向应变随行车速度的增加而减小,且减小幅度在低车速(≤5 km/h)时较大,高车速(>5 km/h)时较小,二者呈良好的幂函数相关关系;承载板各级荷载下的路表竖向变形及中面层层底横向应变的实测结果与有限元数值计算结果的变化规律一致,这表明沥青路面结构的测试结果能有效表征路面结构的真实应变行为。研究结果为承载板试验预估横向应变提供了依据,可供沥青路面检测与养护决策参考。To reveal the variation rule of asphalt pavement strain response,by embedding fiber grating strain and temperature sensors in the field,the simultaneous measurement on bearing plate vertical deformation and asphalt surface course lateral strain at different temperatures was carried out for semi-rigid base asphalt pavement structure.The quantitative relation model was established between the pavement vertical deformation and the middle surface course bottom lateral strain of bearing plate under different loads.Then the quantitative relation model of lateral strain varying with temperature and driving speed was established.The result indicates that the lateral horizontal strain of asphalt middle surface course under dynamic and static loads has obvious viscoelastic-plastic property.The characteristics of lateral static strain duration curve are consistent with Burgers model.The lateral dynamic train duration curve shows the compression-tension waveform.The lateral dynamic and static strain values increase nonlinearly with the increase of pavement temperature,and the increased strain margin decreases gradually with the temperature rise.Both of them have good single logarithmic correlation with temperature.Based on this,the measurement formula of measured strain temperature correction coefficient is obtained.The lateral strain at asphalt middle surface course bottom decreases with the increase of driving speed.The reduction range is larger at low speed(≤5 km/h),and smaller at high speed(>5 km/h).It shows a good power function correlation.The measured results of pavement vertical deformation and middle surface course bottom lateral strain of bearing plate under different loads are consistent with the variation rule of finite element numerical calculation results.It shows that the test results on asphalt pavement structure can effectively characterize the real strain behavior of pavement structure.The study result provides the basis for the lateral strain prediction by using bearing plate,which can be used as the ref

关 键 词：道路工程 横向应变 承载板试验 沥青面层 温度修正 相关性 

分 类 号：U416.217[交通运输工程—道路与铁道工程]