Because the HMA fatigue limit is the theoretical base of perpetual pavement design, to grasp the strain distribution and strain action of HMA layer is key for perpetual pavement design.

• 摘要沥青混合料疲劳极限的存在是永久路面结构设计的主要理论依据，因此掌握沥青层底应变的分布和应变行为规律是永久路面设计的关键。