加速加载下沥青路面地震波模量分析  

Analysis of Seismic Modulus of Asphalt Pavement under Accelerated Loading

作　　者：过震文[1,2] 

机构地区：[1]长沙理工大学,湖南长沙410114 [2]上海市市政规划设计研究院,上海200031

出　　处：《公路交通科技》2014年第6期28-33,共6页Journal of Highway and Transportation Research and Development

基　　金：上海市科委重点科技基金项目(08201202400)

摘　　要：为探索沥青路面地震波模量与路面响应的关系,在细砂路基上的半刚性基层沥青路面进行了MLS66足尺加速加载试验,同时进行了加载区域地震波模量的测试,分析了地震波模量与加载次数、路面温度、车辙变形以及沥青面层底部拉应变的定性或定量关系。结果表明:在加速加载试验过程中,地震波模量随加载次数的衰减过程大致可分为迅速衰减及稳定降低阶段,前一阶段中平均衰减速度为0.1 GPa/万次,模量减少值约占总地震波模量降低值的75%,后一阶段衰减速率降低一个数量级;地震波模量与车辙永久变形呈二次多项式关系;地震波模量与上面层层底温度的变化趋势相反,多项式模拟可较好地表达二者关系;地震波模量与面层层底纵、横向应变变化趋势相反,且变化程度相当。In order to explore the relationship between the seismic modulus of asphalt pavement and pavement response, the full-scale accelerated loading test on semi-rigid base asphalt pavement on fine-sand subgrade are conducted with MLS66. Simultaneously, the seismic modulus of loaded regional pavement is tested. The qualitative or quantitative relationships of seismic modulus with load times, pavement temperature, rutting deformation and tensile strain of asphalt surface bottom are analyzed. The results show that （ 1 ） the decline process of seismic modulus with loading times can be divided into rapid decay and stable lowering in accelerated loading test, the average decline velocity in the prior phase is 0. 1 GPa per 10 thousand times, the seismic modulus reduction is more than 75 % of the whole reduction, while the decline velocity lowered an order of magnitude in the next phase; （2） the relationship between seismic modulus and rutting permanent deformation is quadratic polynomial bottom shows the opposite trend, w （3） the changes of seismic modulus and temperature of upper surface ch can be expressed in multinomial simulation; （4） the opposite trend also exists between the seismic modulus and transversal and longitudinal strains of surface bottom, and the change extents are similar.

关 键 词：道路工程 沥青路面 地震波模量 加速加载 永久变形 应变 

分 类 号：U416.217[交通运输工程—道路与铁道工程]