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运用损伤力学、传热学、断裂力学理论和有限元法,分析了沥青层的温度疲劳损伤特性、疲劳寿命、裂缝扩展等。研究结果表明:温度疲劳损伤主要集中在沥青层表面,随着温变次数的增加,沥青层表面的损伤度线性增加;随着沥青层模量与温变幅值的增加,沥青层表面的损伤度不断增加;随着温变次数的增加,沥青层表面的水平拉应力线性减小;随温变幅值的增大,沥青层的疲劳寿命不断减小;基于高温效应的沥青层最小临界厚度为4cm;增加沥青层厚度和减小沥青层模量可以起到延缓沥青层温度裂缝扩展的作用。研究结果对刚柔复合式路面的合理设计和推广应用有重大意义。
Using the damage mechanics, heat transfer theory, fracture mechanics theory and finite element method, the fatigue damage characteristics, fatigue life and crack propagation of asphalt layer are analyzed. The results show that the temperature fatigue damage mainly concentrates on the surface of the asphalt layer, and the damage degree of the asphalt layer increases linearly with the increase of the number of temperature changes. As the asphalt layer modulus and temperature increase amplitude increase, the damage of the asphalt layer surface With the increase of temperature, the horizontal tensile stress on the surface of asphalt layer decreases linearly; the fatigue life of asphalt layer decreases with the increasing of temperature; the minimum critical thickness of asphalt layer based on high temperature effect 4cm; increasing the thickness of the asphalt layer and decreasing the asphalt layer modulus can play a role in retarding the temperature crack propagation in the asphalt layer. The research results have great significance to the rational design and popularization and application of rigid and flexible composite pavement.