在旧沥青路面上直接实施加铺层而经常出现的反射裂缝,成为沥青路面养护中加铺层主要早期破损之一。文章采用断裂力学理论分析了裂缝尖端的应力状态,应用二维有限元模型,对昌九高速公路试验路加铺层结构进行了计算分析,并根据路表裂缝调查及钻芯取样,探讨了反射裂缝产生和发展机理,提出了实施加铺层的改进措施。 Reflective cracking, which occurs frequently as a result of overburden on old asphalt pavement, has become one of the major early damages of overlays in asphalt pavement maintenance. Based on the theory of fracture mechanics, the stress state of crack tip is analyzed. The two-dimensional finite element model is used to calculate and analyze the overlay structure of Changjiu Jiuzhou Expressway. According to the road surface crack investigation and core sampling, Cracks generation and development mechanism, put forward the implementation of overlay improvement measures.