沥青路面力学响应影响因素敏感性分析

Sensitivity analysis of influence factors on mechanical response of asphalt pavement

以修正的Burgers模型作为沥青混合料本构模型,通过有限元软件分析了荷载大小、加载方式以及面层材料对路表竖向位移、底基层底面水平应力、面层内剪应力以及路表轮迹处竖向应力的影响.结果表明:荷载大小为影响沥青路面应力场和变形场的最主要因素,胎压1.0MPa较0.7MPa的作用效果增大40%,随着荷载的继续增大作用效果将继续增大;沥青路面的主要承重部分为基层以下的结构体,面层材料的类型和力学参数对沥青混凝土路面力学响应影响相对较小.该研究可以为沥青路面的优化设计与力学分析提供一定的理论指导.

The authors adopted the modified Burgers model as the constitute model of asphalt mixtures to analyze load magnitude, loading methods and the material of surface having the influence on the vertical displacement of road surface, horizontal stress of subbase bottom, shear stress within the surface and the vertical stress at the wheel track in road surface, with the finite element software. The results showed that the main factor of affecting the stress and deformation field of asphalt pavement is load; The effect of tire pressure 1.0 Mpa has increased by 40% comparing to the effect of tire pressure 0.7 Mpa; As the load increases, the effect will continue to increase; The main load bearing part of Asphalt concrete pavement is the structure under the base course; the influence of the type of pavement materials and mechanical parameters on the mechanical response of asphalt concrete is relatively smaller; The research can provide theoretical guidance for optimization design and mechanical analysis of asphalt pavement.