关键词: 道路工程, 粒料类基层, 沥青路面, 动应力, 有限元

Abstract: Based on the emphasis on the granule base in the new asphalt pavement design specification, the structure model of the granule base asphalt pavement was established by using the finite element software ANSYS, and the dynamic transient analysis was carried out by two loading methods. It is concluded that: ①At the same depth and different positions on the vehicle driving track line, the shape and peak value of the stress time-history curve under the action of fluctuating load on the observation points are quite different, while the shape and peak value of the stress time-history curve under the action of uniform load are almost the same. However, the stress extremes obtained by the two loading methods are basically the same. ②Regardless of the loading mode, the deeper the road surface is downward, the smaller the stress peak value is, the stronger the diffusion effect is, and the slower the response of the observation point to the load is. ③The vertical stress decreases downward from the surface; the longitudinal horizontal stress is always greater in the longitudinal direction than in the transverse direction. These conclusions can provide reference for the stress conditions of granular base asphalt pavement under different dynamic loads.

Key words: road engineering, granular base, asphalt pavement, dynamic stress, finite element