重载沥青路面结构组合的抗车辙性能分析

Rutting resistance analysis of structure combinations for asphalt pavement subjected to heavy loads

为研究结构组合对沥青混合料抗车辙性能的影响,首先对所设计的7种沥青混合料进行动态模量及单层车辙试验,得到基本材料参数及抗车辙性能;然后对7种混合料组合而成的3种路面结构在重载条件下进行双层结构车辙试验,并与单层车辙试验结果进行对比分析;最后,应用光纤光栅智能测试技术对实际路面进行现场应变测试,根据不同路面结构三向应变测试结果评价实际重载沥青路面结构的抗车辙性能.结果表明,单层车辙试验难以准确反映路面结构的抗车辙性能,而双层车辙试验效果良好.在设计抗车辙路面时要考虑不同面层的模量组合,才能最大程度地发挥各层混合料的抗车辙性能.

To study the effect of structure combinations on rutting resistance, firstly, dynamic modulus tests and single-layered wheel tracking tests were carried out to get basic parameters and anti-rutting resistance of seven asphalt mixtures designed. Secondly, double-layered structural wheel tracking tests subjected to heavy loads were conducted for three pavement structure combinations made up of asphalt mixtures utilized, and then compared the results with the single-layered ones. Finally, three-directional strain of pavement was got on site utilizing fiber Bragg grating （FBG） intelligent test technology, and the rutting resistance of actual asphalt pavement was evaluated through these results. Results show that rutting resistance of pavement structures cannot be reflected by single-layered wheel tracking test accurately, while the double-layered does. Additionally, modulus combinations with different layers must be taken into account in order to maximize the rutting resistance of asphalt mixtures.