不同工况下沥青混合料黏弹性参数研究  

Research on asphalt mixture viscoelastic parameters under different conditions

作　　者：彭东黎[1] 张家生[2] 龙尧[2] 

机构地区：[1]湖南交通职业技术学院工程经济学院,湖南长沙410132 [2]中南大学土木工程学院,湖南长沙410075

出　　处：《铁道科学与工程学报》2016年第4期689-696,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51378514)

摘　　要：通过AC-20C沥青混合料不同工况下室内车辙试验,采用循环应力下的沥青混合料本构模型,分析温度、荷载和作用时间对车辙和模型黏弹性参数的影响规律,为沥青混合料的设计提供参考。研究结果表明:通过正交分析,对车辙深度的影响,温度的影响最大,作用时间次之,温度的影响程度是作用时间、荷载的2倍和10倍。温度、荷载和作用时间对于沥青混合料本构模型中的4个黏弹性参数(E_1,η_2,E_3,η_3)的影响各有不同:对参数E_1的影响,作用时间分别是温度和荷载所对应值的1.6倍和4倍;对于参数η_2的影响,温度影响为作用时间和荷载的1.5倍,而后两者的影响程度相当;对参数E_3的影响,温度和荷载影响基本相同,两者是作用时间的2.5倍;对参数η_3的影响,荷载和作用时间对η_3的影响差别不大,荷载和作用时间分别是温度的1.6倍和1.4倍。通过温度和作用时间的共同作用分析,高温和长作用时间共同作用是车辙变形急剧增大的主要原因。Through the rutting test under different conditions and constitutive model of asphalt mixture （AC -20C）with cyclic stress,the impact of temperature,stress and loading time on rutting deformation and viscoelas-tic parameters were researched,which can provide a reference for design of asphalt mixture.Through the orthog-onal analysis,the test results show that temperature has the most important impact on rutting,while loading time play a secondary role.The influence degree of temperature is 2 and 10 times of loading time and stress,respec-tively.Meanwhile,the impact of temperature,loading time and stress on viscoelastic parameters（E1 ,η2 ,E3 ,η3 ） of the constitutive model are different.The impact of loading time on the E1 is 1 .6 and 4 times than that of tem-perature and stress,respectively.Then the impact of temperature on η2 is found to be 1 .5 times than loading time and stress.As for the E3 ,the impact of temperature and stress are mostly similar which are 2.5 times than that of loading time.Finally,the impacts of stress and loading time are 1 .6 and 1 .4 times than that of tempera-ture,respectively.Through the analysis of combining impact of temperature and loading time,the main reason for the enormous increase of rutting deformation is the combined effect of higher temperature and longer loading time.

关 键 词：沥青混合料 黏弹性 本构模型 正交分析 车辙 

分 类 号：U416.217[交通运输工程—道路与铁道工程]