车辆荷载作用下纤维沥青路面响应分析

Response of Fiber Reinforced Asphalt Pavement Subjected to Vehicle Load

基于弹性理论,采用有限元方法分析车辆荷载作用下,纤维沥青混凝土的模量、不同道路等级下的纤维沥青混凝土层位置和厚度、基层厚度对路表最大弯沉、基层和底基层的层底径向应力的影响。结果表明,纤维加入到沥青路面后,提高了路面的整体变形能力,从而可以减小路面面层的厚度;基层厚度的增加,不仅缓解了由于纤维沥青混凝土面层厚度减小而产生的基层和底基层的层底径向应力的增加,而且可以减小纤维沥青混凝土的掺入量。在考虑提高路面结构的整体性以及面层和基层之间的粘结力时,给出了不同道路等级下纤维沥青路面结构的合理设计。

In order to investigate the response of polyester fiber reinforced asphalt pavement subjected to vehicle load and the reasonable design of fibers reinforced asphalt pavement structure, the response of polyester fibers reinforced asphalt pavement subjected to vehicle load was analyzed by finite element method based on elastic mechanics. The vehicle load was simplified as static load. The effects of modulus of fiber reinforced asphalt concrete, location and thickness of fiber reinforced asphalt concrete layer, and thickness of base on the maximum deflection of surface of road, and tensile stresses of bottom of base and sub-base were discussed. Results indicate that the resistance to deformation of pavement is improved clue to addition of fiber to the pavement, and therefore the thickness of surface layer may be decreased. The tensile stresses of the bottom of base and sub-base were not only decreased, but also the dosage of fiber reinforced concrete was reduced as result of the increase of thickness of base.The reasonable design of fiber reinforced asphalt pavement structure under different highway levels was proposed for increasing integrity of pavement structure and cementation between base and sub-base.