季冻区无机结合料稳定基层沥青路面典型病害机理分析

Analysis on Typical Disease Mechanism of Inorganic Binder Base Asphalt Pavement in Seasonal Frozen Area

针对季冻区无机结合料稳定基层路面结构,根据路面结构热传导理论完成路面结构温度场建立,作为冬季低温开裂和夏季高温变形分析的预定义场,并通过分段累加低温应力和采用非均匀分布施加荷载的方式完成对典型病害的模拟分析。结果表明,无机结合料稳定基层底部在低温环境下最先开裂,导致路面结构出现由下至上的反射裂缝,面层结构全深度范围内均受到永久变形的影响并呈现明显的U性凹陷,属于典型的结构型车辙。

Foundation of pavement structure temperature field based on heat conduction theory of pavement structure for inorganic binder base pavement in seasonal freezing zone,was prediction for low temperature cracking in winter and high temperature deformation in summer,then the typical diseases were simulated and analyzed by piecewise accumulating low temperature stress and applying load with non-uniform distribution.The results show that the base of inorganic binder cracks first under low temperature environment,resulting in reflective cracks from bottom to top of the pavement structure;the pavement structure is affected by permanent deformation in the whole depth range and presents typical U-shaped depression,which is a typical structural rut.