This paper via ABAQUS finite element software,established 2D pavement model work-ing with crack.simulating dynamic load effects on the road by sine wave,using Virtual closing legal,as-phalt pavement crack stress intensity factor K2 are calculated,and the sametime,Material damping param-eters are considered,to discover the variation of K2 ,then using Paris formula,analysis the fatigue life effected by material damping parameters.In order to provide a theoretical reference of pavement dynamic damage study.%通过 ABAQUS 有限元软件建立带缝工作的二维路面模型，通过正弦波模拟车辆对路面的动荷载效应，通过虚拟闭合法，计算沥青路面 Top-Down 裂缝的应力强度因子 K2，并探讨了考虑沥青混合料阻尼特征下，沥青路面的剪切型强度因子 K2的变化规律，再进一步通过 Paris 模型，分析阻尼特征对 Top-Down 裂缝疲劳寿命的影响。以期为路面动态破坏研究提供一定的理论参考。
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