CRC＋AC复合式路面结构层厚度对温度效应及车辙变形的影响

针对连续配筋混凝土与沥青混凝土（CRC＋AC）复合式路面结构的特点和现有研究的不足,运用断裂力学理论和有限元法,计算了CRC层的最大温度梯度、车辙深度、温度裂缝的扩展强度,分析了结构层厚度与CRC层的最大温度梯度、车辙深度、温度裂缝扩展强度的关系。结果表明：AC层厚度一般在不小于4cm时才能起到降低CRC层顶面最大温度的作用;CRC层的最大温度梯度随AC层和CRC层厚度的增加而递减;车辙深度随着AC层厚度的增加而递增;AC层厚度的增加能有效减小温度裂缝的扩展,其他结构层厚度对温度裂缝的扩展强度影响不大。研究结果可为合理设计CRC＋AC复合式路面的结构层厚度提供参考。

Influence of Structure Layer Thickness of CRC+AC Composite Pavement on Temperature Effect and Rutting Deformation

Aimed at structure characteristics and the flaws of existing studies of continuous reinforced concrete and asphalt concrete(CRC+AC) composite pavement,some different data were calculated by using fracture mechanics theory and finite element method(FEM),including the maximum temperature gradient of CRC layer,the rutting depth and the thermal crack propagation strength,and the relations between the structure layer thickness and these data respectively were analyzed.Results show that when the thickness of AC layer is not less than 4 cm,the maximum temperature of CRC layer top surface can be reduced.The maximum temperature gradient of CRC layer decreases when the thicknesses of AC layer and CRC layer increase.The rutting depth increases as the thickness of AC layer increases.The thermal crack propagation can be effectively reduced as the thickness of AC layer increases,and other structure layer thicknesses have little effect on the thermal crack propagation.The study results can provide reference for rational design of structure layer thickness of CRC+AC.