重复荷载下沥青混合料永久变形的粘弹性力学模型  

Viscoelastic Mechanical Model of Permanent Deformation of Asphalt Mixtures under Repeated Load

作　　者：张裕卿[1] 黄晓明[1] 

机构地区：[1]东南大学交通学院,江苏南京210096

出　　处：《公路交通科技》2008年第4期1-6,共6页Journal of Highway and Transportation Research and Development

基　　金：国家高技术研究发展计划(863计划)资助项目(2006AA11Z110);江苏省普通高校研究生科研创新计划资助项目(CX07B-158Z)

摘　　要：基于修正Burgers模型推导了适用于重复荷载下沥青混合料永久变形规律的粘弹性力学模型,并利用该模型对AC20和SMA13沥青混合料三轴重复荷载永久变形试验结果进行了回归,获得了模型的参数,并对沥青混合料进行了永久变形规律的分析。研究结果表明,沥青混合料在荷载重复作用下,会出现迁移期、稳定期和破坏期3阶段变形规律;模型参数均随温度的升高而降低,但与偏应力水平无关;较高温度和应力均是导致较大永久变形的主要因素。推导出的粘弹性力学模型可以较准确地描述重复荷载下沥青混合料的永久变形规律,可以用于重复荷载下沥青混凝土永久变形的力学计算与分析。Based on the modified Burgers model, a viscoelastic mechanical model, which could be employed to research permanent deformation of asphalt mixtures under repeated load, was deduced. Then triaxial repeated load permanent deformation test results of AC20 and SMA13 asphalt mixtures were regressed by the deduced viscoelastic model to obtain parameters of the model and to investigate the permanent deformation properties of the asphalt mixtures. Results indicate that the permanent deformation of asphalt mixtures under repeated load could be defined by three stages： transference, stabilization and breakage. Parameters of the deduced viscoelastic model decrease with the raise of temperature, but are independent of deviator stress levels. Both high temperature and high deviator stress are the pivotal factors leading to great permanent deformation of asphalt mixtures. Test results also show that the deduced model could accurately describe permanent deformation properties of asphalt mixtures under repeated load and could be used in permanent deformation calculation and analysis of asphalt mixtures under repeated load.

关 键 词：道路工程 沥青混合料 修正Burgers模型 永久变形 重复荷载 

分 类 号：U416.217[交通运输工程—道路与铁道工程]