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低温缩裂是沥青路面使用过程中遇到的主要病害之一,为了更清楚地揭示沥青路面低温缩裂的机理,基于内聚力模型,运用ABAQUS有限元软件对沥青路面的低温缩裂过程进行数值模拟。建立了粘弹性分析的模型,对约束试件温度应力试验(TSRST)进行数值模拟,其数值模拟结果与试验结果非常接近;拟定路面结构内聚力及粘弹性材料参数,模拟了不同降温时间情况下沥青面层断裂损伤的情况。结果表明:低温缩裂模型中加入粘弹性参数后,路表面层发生初始损伤的起始温度要求更低;从断裂过程上来看,弹性的沥青面层开裂具有瞬时性,开裂过程极为短暂;加入粘弹性材料参数后,沥青路面开裂具有过程性,比弹性的路面结构更接近实际沥青路面的开裂状况。
In order to reveal the mechanism of low temperature shrinkage of asphalt pavement more clearly, low temperature shrinkage is one of the main diseases encountered in the process of asphalt pavement. Based on the cohesion model, the numerical simulation of low temperature shrinkage process of asphalt pavement is carried out by ABAQUS finite element software . A model of viscoelasticity analysis was established to simulate the temperature stress test (TSRST) of constrained specimens. The numerical simulation results are very close to the experimental ones. The cohesion and viscoelastic material parameters of the pavement structure were formulated to simulate the asphalt mixture under different cooling time Surface fracture damage situation. The results show that the initial temperature of the initial damage of road surface layer is lower when the viscoelastic parameters are added into the low-temperature collapse model. From the point of view of fracture process, the cracking of the elastic asphalt surface is transient and the cracking process is very short. Viscoelastic material parameters, asphalt pavement cracking process is more than the elastic pavement structure closer to the actual asphalt pavement cracking conditions.