车辙变形在上下面层分布情况调查分析

Survey of Rut Deformation Distribution on Binder and Wearing Courses

对已通车2年的某高速公路和已通车6年的某高速公路发生车辙路段进行调查测试与室内芯样测量分析,得出了车辙病害的主要特征,以及在两层式路面结构中的分布情况。测量分析结果表明,车辙深度较深(大于60mm)时,上、下面层均发生了较大的变形,且下面层的压缩变形率大于上面层;当车辙深度较浅(小于40mm)时,下面层的压缩变形率小于上面层。就对车辙的贡献率或者在形成车辙中所占的份额而言,上面层约占30%左右,下面层约占70%左右,这主要是下面层厚度是上面层的1倍所致。

The main features of rut distress and rut distribution data in two-layer pavement structure are identified through site survey and laboratory core sample analysis for rut occurred road sections of expressways, which have been opened to traffic for two and six years respectively. The survey and analysis show that when the rut depth is deeper （more than 60 mm） , the greater deformation would be found both in wearing course and binder course, and the compression deformation ratio of binder course is higher than that of wearing course. While, when the rut depth is lower （less than 40 mm） , the compression deformation ratio of binder course is lower than that of wearing course. For the formation of a rut, the wearing course and binder course attribute to 30% and 70% respectively. This is because the thickness of the binder course is one fold of the wearing course.