服役柔性基层沥青路面力学响应实测与分析  

Field Measurement and Analysis on Mechanical Response of Asphalt Pavement with Flexible Base Course in Service

作　　者：刘力源[1,2] 程怀磊 张翛 赵队家 徐丽飞 LIU Li-yuan;CHENG Huai-lei;ZHANG Xiao;ZHAO Dui-jia;XU Li-fei(Key Laboratory of Road and Traffic Engineering of Ministry of Education,Tongji University,Shanghai 201804,China;Shanxi Yellow River Frontier Materials Research Institute Co.,Ltd.,Taiyuan Shanxi 030000,China;School of Civil Engineering,Taiyuan University of Technology,Taiyuan Shanxi 030024,China;Key Laboratory of Highway Construction and Maintenance Technology in Loess Region of Ministry of Transport,Taiyuan Shanxi 030006,China)

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海201804 [2]山西黄河前沿新材料研究院有限公司,山西太原030000 [3]太原理工大学土木工程学院,山西太原030024 [4]黄土地区公路建设与养护技术交通行业重点实验室,山西太原030006

出　　处：《公路交通科技》2022年第4期11-21,40,共12页Journal of Highway and Transportation Research and Development

基　　金：国家重点研发计划项目(2018YFB1600100);国家自然科学基金项目(5210081231);中国博士后科学基金项目(BX2021216,2021M702479)。

摘　　要：沥青路面沥青层的力学响应是路面设计的一个重要参数,准确表征现场沥青层的力学响应对提高路面设计的可靠性有重要意义。通过现场实车加载试验,采集了服役柔性沥青路面的应变数据,分析了不同层位、轴重、荷载移动速度、温度等工况下的应变波形特征,计算了不同加载工况下沥青层的应变数值情况,并对应变数值进行了数理统计分析。结果表明:在轮胎-路面不同承载位置,沥青路面下面层层底的纵横向应变波形曲线有明显差异;轴重、温度、轴载移动速度都会对沥青层底应变产生显著的影响,但不会明显改变应变波形特征,轴重增加、温度升高、轴载移动速度降低都会导致纵横向应变曲线整体升高,应变极值增大。ATB层底和沥青下面层层底相比,其应变响应波形也有明显差异,并具有一定的滞后性;轴重与温度这两个因素对路面力学响应的交互作用明显,在不同温度下,轴重对于横纵应变极值的影响程度具有显著差异;车速与轴重,车速与温度之间的交互作用不明显。基于上述关系,进一步拟合得到多因素(速度、温度、轴重)作用下沥青层横向应变值与纵向应变值的预估模型,以预估其他不同工况下柔性基层路面的应变响应。The mechanical response of asphalt layer of asphalt pavement is an essential parameter for pavement design.An accurate characterization of the mechanical response of in-situ asphalt layer is of great significance to improve the reliability of pavement design.The strain data of the service flexible asphalt pavement are collected by field vehicular loading test.The characteristics of strain waveforms and the strain values under various loading conditions including different layers,axle loads,vehicular speeds and temperatures are analysed and calculated,and the mathematical statistic analysis is carried out on the strain values.The result shows that(1)The longitudinal and transverse strain waveform curves of the lower surface layer of asphalt pavement at different tire loading positions are significantly different.(2)The axle load,temperature and vehicular speed all have significant influences on the strains at the bottom of asphalt layer,but do not significantly change the strain waveform shapes.The increase in axle load,temperature or the decrease in the vehicular speed all leads to an overall increase in the extreme values of transverse and longitudinal strain curves.Compared with the waveforms and the bottom of the asphalt lower surface course,the strain response waveform at bottom of the ATB layer is also significantly different,and has a certain hysteresis.(3)The interaction between axle load and temperature on the mechanical response of pavement is obvious.At different temperatures,the influence of axle load on the extreme values of longitudinal and lateral strain is significantular different.(4)The interaction between vehicle speed and axle load and the interaction between vehicular speed and temperature are not obvious.Based on the above relationships,the prediction model of the lateral longitudinal strain values of the asphalt layer under the action of multiple factors(speed,temperature,axle load)is further fitted to predict the strain response of the flexible base pavement under other different working co

关 键 词：道路工程 力学响应 实测 服役柔性基层沥青路面 应变波形曲线 方差分析 

分 类 号：U416.217[交通运输工程—道路与铁道工程]