超长服役期沥青路面内部损伤规律研究

Study on Internal Damage Law of Asphalt Pavement in Super Long Service Period

为研究沥青路面结构内部损伤发展与道路结构形式相关性,采用三维探地雷达对超长服役期的组合式基层沥青路面结构进行内部损伤探测,分析路面结构内部损伤主要类型,研究沥青路面结构内部损伤与填挖形式、路基特征与防护特征等因素相关性,理清超长服役期的沥青路面结构内部损伤发展规律.结果表明:组合式基层路面结构部分内部裂缝即使在超长的服役中也无法反射至路表,硬路肩在无交通荷载作用下同样会产生裂缝病害,设置挡墙可减少硬路肩开裂风险,但会增大行车道开裂风险.

In order to study the correlation between internal damage development of asphalt pavement structure and road structure form, 3 D ground penetrating radar(GPR) was used to detect the internal damage of combined base asphalt pavement structure with long service life. The main types of pavement internal damage were analyzed, and the correlation between internal damage of asphalt pavement structure and filling and excavation forms, subgrade characteristics and protection characteristics were studied. The development law of internal damage of asphalt pavement structure with long service life was clarified. The results show that the internal cracks of the combined base pavement structure can’t be reflected to the pavement surface even in the long service. Hard shoulder will also produce crack disease without traffic load. Setting retaining wall can reduce the risk of hard shoulder cracking, but it will increase the risk of lane cracking.