Abstract: For further research into rut disease mechanism of asphalt surface course of rigid-flexible composite pavement, wheel rutting test was used to simulate dynamic load on pavement. The dynamic strain of asphalt mixture of different types under different temperature, under different loads in sizes and directions were measured by use of optical fiber testing technology to analyze the characters of wheel rutting deformation of asphalt surface course in composite pavement from the three aspects of load size, mixture types and the temperature. The result showed that under dynamic loading, the cross strain of the asphalt surface course of the rigid-flexible composite pavement is less than the longitudinal strain. After removal of load, the cross strain can recover by 60% while the longitudinal strain can recover only by 20%. Within given range there exists a positive linear relationship between the dynamic strain of asphalt mixture and load size while a reverse directional linear relationship between strain recovering ability and load size. SMA is of 12% less dynamic strain than AC and of 60% higher recovering ability. In the surroundings of high temperarture, indirect loading may also cause strain of asphalt mixture and SMA has a notably higher resistance against deformation than AC.

Key words: road engineering, composite pavement, asphalt surface course, dynamic strain, optical fiber measurement technology

摘要： 为深入研究刚柔复合式路面沥青面层车辙病害机理，采用复合路面结构车辙试验模拟路面荷载动态作用，借助光纤光栅应变检测技术测试不同方向、不同荷载、不同类型混合料和不同温度下沥青混合料的动态应变，从荷载大小、混合料类型和温度3个方面分析复合式路面沥青面层车辙变形特征。结果表明：动态荷载作用下刚柔复合式路面沥青面层的横向应变小于纵向应变，荷载消除后横向应变可恢复60%，而纵向应变仅可恢复20%；一定范围内沥青混合料动态应变与荷载大小成正线性关系，应变的恢复能力与荷载大小成反向线性关系；SMA的应变比AC小12%，而变形恢复能力高出约60%；高温环境下，荷载间接作用也会引起沥青混合料的应变，SMA的抗变形能力明显高于AC沥青混合料。

关键词: 道路工程, 复合式路面, 沥青面层, 动态应变, 光纤测试技术