摘要
现场车辙调查表明,路面车辙一般集中在行车道轮迹处,超车道和停车道基本没有车辙,而且车辙较深的路段通常沿车辙带分布着带状泛油.在车辙槽处和停车道上钻心取样,对不同面层的混合料进行对比抽提试验.抽提试验结果显示车辙处沥青产生自下往上的迁移:上面层混合料的油石比增大,中、下面层混合料的油石比减小.运用非线性粘弹性力学原理解释了沥青迁移的机理,即行车荷载下路面结构产生了剪应力,而剪切应力会产生法向应力,导致沥青材料沿剪切应力的法向产生流动.最后,探讨了减轻沥青迁移的技术措施.
Field investigation indicated that rut of asphalt pavement mostly concentrated on the wheel track of carriageway, while there was little rut on passing lane and emergency parking lane. On the section with deeper rut, there was usually a belt bleeding along wheel track. Drilled several cores at rut spot and emergency parking lane, and then extracting tests were undertaken on the asphalt mixtures of different layers. Compared with the asphalt-aggregation ratios of asphalt mixtures on emergency parking lane, the asphalt aggregation ratios increased in upper layer, but decreased in middle and lower layer, as much as to say that asphalt migrated from down to top. Based on non liner viscoelastic mechanics, this asphalt migration phenomenon was explained. Shear stress caused by vehicle load produces normal stress, and normal stress makes asphalt flow along the normal direction of shear stress. Finally, technical methods retarding such a migration were discussed.
出处
《武汉理工大学学报（交通科学与工程版）》
2008年第4期596-598,606,共4页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
江苏省公路科学研究计划项目资助(批准号:No.06Y31)
关键词
道路工程
车辙
油石比
沥青迁移
粘弹性
road engineering
rut asphalt aggregation ratio
asphalt migration viscoelastic
