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

摘要： 基于新版沥青路面设计规范中对粒料类基层的重视，采用有限元软件ANSYS建立粒料类基层沥青混凝土路面的结构模型，通过两种方式加载进行动力学瞬态分析，得到：①在车辆行驶轨迹线上，同一深度、不同位置的观测点上波动荷载作用下的应力时程曲线形状、峰值相差较大，而均布荷载作用下的应力时程曲线形状、峰值几乎完全相等，但两种加载方式得到的应力极值基本相同；②不论哪种加载方式，路表向下越深，应力峰值越小、扩散作用越强，观测点对荷载的反应越滞后；③垂向应力由表向下递减；水平应力总是纵向大于横向。此结论可为粒料类基层沥青路面在不同动载作用下的应力工况提供参考依据。

关键词: 道路工程, 粒料类基层, 沥青路面, 动应力, 有限元