长大纵坡路段沥青路面车辙规律和影响因素  

Rutting Rule and Influencing Factors of Asphalt Pavement in Large Longitudinal Slope Section

作　　者：周健民 吴博 ZHOU Jian-min;WU Bo(Tangshan Expressway Group Co.,Ltd.,Tangshan Hebei 063011,China;School of Highway,Chang'an University,Xi'an Shaanxi 710064,China)

机构地区：[1]唐山高速公路集团有限公司,河北唐山063011 [2]长安大学公路学院,陕西西安710064

出　　处：《公路交通科技》2021年第7期9-16,44,共9页Journal of Highway and Transportation Research and Development

摘　　要：为了探明长大纵坡路段车辙的分布特征及影响因素,改善沥青路面的抗车辙性能,以铜黄高速公路为依托,调查了该公路的日平均交通量和长大纵坡路段的车辙病害。首先,通过测量不同长大纵坡路段的车辙深度,分析了车辙沿深度方向的分布特点;其次,通过开挖典型车辙断面,分析了车辙在路面结构层内的分布规律;再次,钻取了典型车辙病害路段的圆柱形路面芯样(芯样直径150 mm),并结合圆柱形试件车辙试验(CSWTT)结果,揭示了长大纵坡路段沥青路面车辙的分布规律和产生机理;最后,分析了纵坡坡度与坡长、行车速度、温度、沥青混合料材料特性等因素对长大纵坡路段车辙的影响,同时提出了改善沥青路面长大纵坡路段抗车辙性能的建议。结果表明:长大纵坡路段沥青路面的车辙主要分布于中、下面层;长大纵坡路段的车辙主要由压密变形和剪切流动变形组成,前者来自于行车荷载的碾压,后者则是由沥青混合料在多因素(重载、高温、慢速等)耦合作用下的抗剪切能力不足引起,且后者对车辙产生的贡献率更大;当其他条件相同时,坡长对车辙的贡献率高于坡度,当纵坡坡长较长(超过或接近临界坡长),坡度较大(>3%)时,则车速降低最快,相应地,长大纵坡路段沥青路面车辙最为严重。In order to clarify the rutting distribution characteristics and its influencing factors of large longitudinal slope section,and improve the anti-rutting performance of asphalt pavements,Based on Tongling-Huangshan expressway,the average daily traffic(ADT)and rutting in large longitudinal slope section are investigated.First,the rutting distribution along the depth is analyzed by measuring the rutting depth in different large longitudinal slope sections.Then,the rutting distribution rule in the pavement structure layers is analyzed by excavating typical rutting sections.Afterwards,the cylindrical core samples(Φ150 mm)of typical rutting disease sections are drilled,and the rutting distribution rule and generation mechanism on long longitudinal slope section is revealed combining with the result of the cylindrical sample wheel tracking test(CSWTT).Finally,the influences of longitudinal slope and slope length,vehicle speed,temperature,and characteristics of asphalt mixture on the rutting are analyzed,and the suggestions for improving the anti-rutting performance of large longitudinal slope sections of asphalt pavement are proposed.The result indicates that(1)The rutting in large longitudinal slope section is mainly distributed in middle and lower surface courses.(2)The rutting is mainly composed of compaction deformation and shear flow deformation,the former is caused by grinding from traffic load and the latter is ascribed to insufficient shear ability of asphalt mixture under the couple effects of heavy load,high temperature and low speed,etc.,and shear flow deformation contributes more to rutting than compact deformation.(3)Slope length also contributes more to rutting than longitudinal slope when other factors remain the same.When the slope length is longer(approaching or exceeding the limit slope length)and the longitudinal slope is larger(>3%),the vehicle speed drops the greatest.Correspondingly,the rutting of asphalt pavement in large longitudinal slope section is the most severe.

关 键 词：道路工程 车辙规律 钻芯取样 长大纵坡 产生机理 

分 类 号：U416.217[交通运输工程—道路与铁道工程]