长寿沥青路面结构的层厚设计与分析

介绍和讨论了一种用于重交通长寿沥青路面的层厚设计方法。该方法基于限制沥青层底的拉应变和路基顶面的压应变，采用两个准则来校核所设计的沥青层厚度的适宜性：一是控制设计荷载作用下的最大路表弯沉；二是控制相邻两个无结合料处治的集料层的模量比。采用“等效模量”概念来考虑路基、路面材料的模量随季节的变化；在预测疲劳（与荷载相关的裂缝）和路基变形时，采用了“累计损伤”的概念。给出了广东—梧州高速试验路段长寿沥青路面结构组合设计实例，最后对与疲劳裂缝有关的两个关键问题进行了讨论。

Design and analysis of layer thickness of perpetual asphalt pavement structure

A design method of layer thickness of perpetual asphalt pavement structure for heavy traffic is introduced and discussed. Based on limiting the tensile strain at the bottom of the asphalt layer and the vertical compressive strain at the top of the subgrade, the suitability of layer thickness is checked by two criteria. One is controlling the maximum surface deflection under the design load, and the other is controlling the modulus ratio between adjacent unbound aggregate base and subbase layer. The cumulative damage concept in predicting the fatigue (load-related cracking) and subgrade distortion is applied. Seasonal variations of material properties are considered by using equivalent modulus concept. A practical design of perpetual asphalt pavement structure for Guangdong to Wuzhou Expressway in Guangdong Province, China, is presented. Two key design issues related to fatigue cracking are discussed.