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通过试验路观测沥青道路结构内实际温度值,总结道路结构内实际温度分布情况及变化规律。在此基础上建立低温下沥青混凝土道路热—结构耦合三维有限元模型,分析降温幅度、沥青面层及基层参数对沥青混凝土路面温度应力的影响规律。此外,还考虑了沥青面层与基层间的接触状况对温度应力的影响。结果表明:降温幅度的变化对道路结构内所引起的温度应力产生的影响最大;沥青面层模量及面层温缩系数的变化对结构内的温度应力影响较大;而沥青面层厚度、基层厚度及基层模量的变化对结构内的温度应力影响都有限,当这些参数值发生变化时,温度应力基本保持不变;层间接触状态的变化对路面结构的力学响应有一定的影响,特别是层间接触状态不同的接触界面。
The actual temperature in asphalt pavement structure was observed through the test road, and the actual temperature distribution and variation in the road structure were summarized. On this basis, a three-dimensional finite element model of thermal-structural coupling of asphalt concrete pavement at low temperature is established. The influence of temperature drop, asphalt pavement and grassroots parameters on temperature stress of asphalt pavement is analyzed. In addition, the influence of the contact condition between asphalt surface and grassroots on the temperature stress is also considered. The results show that: the change of cooling rate has the greatest influence on the temperature stress caused in the road structure; the change of asphalt surface modulus and temperature coefficient have a great influence on the temperature stress in the structure; while the thickness of asphalt surface, The change of base thickness and base modulus has a limited influence on the temperature stress in the structure. When these parameters change, the temperature stress remains basically unchanged. The change of contact state has some influence on the mechanical response of pavement structure, In particular, contact between different contact state interface.