高温条件下沥青路面结构剪应变分析

温度和应力荷载的耦合效应是评价沥青路面结构稳定性的关键因素。温度梯度和外荷载是路面结构变形和破坏的直接原因。基于沥青混合料热粘弹变形理论,建立了高温动态载荷作用下路面破坏的耦合动力学模型,模拟分析了沥青路面温度场和应力场的分布规律以及影响沥青路面破坏的关键因素。模拟结果与监测结果基本一致,表明该模型用于沥青路面日变温度分析是可靠的。天气情况对监测结果有很大影响,温度变化直接影响模量,进而影响压缩性和抗剪强度,但对竖向应力影响不大。通过对不同温度下沥青路面变形的监测和模拟结果的比较,进一步验证了模型的可靠性,为沥青路面的优化设计和损坏控制技术提供了关键参数。

Shear strain analysis of asphalt pavement structure under high temperature

the coupling effect of temperature and stress load is the key factor to evaluate the structural stability of asphalt pavement. Temperature gradient and external load are the direct causes of deformation and failure of pavement structure. The coupling dynamic model of the failure under high temperature dynamic load is established based on the thermal viscoelastic deformation theory of asphalt mixture. The distribution law of temperature field and stress field of asphalt pavement is simulated and analyzed, as well as the key factors affecting the damage of asphalt pavement. The simulation results are basically consistent with the monitoring results, which shows that the model is reliable for the analysis of daily variation temperature of asphalt pavement. Weather conditions have a great influence on the monitoring results. The change of temperature directly affects the modulus, then the compressibility and shear strength, but has little effect on the vertical stress. Through the comparison of monitoring and simulation results of asphalt pavement deformation under different temperatures, the reliability of the model is further verified. These conclusions provide key parameters for optimal design and damage control technology of asphalt pavement.