Finite element modelling of partially saturated asphalt specimens subjected to frost – towards an explanation of winter potholes
Finite element modelling of partially saturated asphalt specimens subjected to frost – towards an explanation of winter potholes
复制标题
遭受霜冻的部分饱和沥青样本的有限元建模——解释冬季坑洼
DOI：
10.1080/10298436.2020.1843036
复制
发表时间：
2020
影响因子：
3.8
通讯作者：
F. Hammoum
中科院分区：
文献类型：
--
作者：
V. Vu;O. Chupin;J. Piau;F. Hammoum
摘要这篇文章涉及沥青路面坑槽的发展可能发生在冬季在负温度和存在孔隙水的沥青混凝土（AC）层。它已经表明，这种类型的降解可能是由于AC孔隙水的溶胀。一个本构关系是以前开发的模型这种现象，本文涉及其实施的有限元（FE）程序，以评估所引起的机械效应在路面上的霜冻前的传播。这个新的程序处理的热粘弹性问题之间的耦合与AC材料的溶胀和热方程的相变。首先适用于部分饱和AC试样的特性测试建模，开发的程序已被证明是相关的。然后，为了更接近现场条件，对部分饱和的双层AC结构进行了原始冻融试验。该测试导致在第二次冻融循环期间两层的分层。其模型表明，界面断裂是由样品中的差应变和自应力场触发的。这些结果可以为壶穴问题的初始化提供解释。
ABSTRACT This article is related to the development of potholes in bituminous pavements possibly occurring in winter at negative temperature and in presence of pore water in the asphalt concrete (AC) layers. It was shown already that this type of degradation could be due to swelling of the AC pore water. A constitutive law was previously developed to model this phenomenon; the present article deals with its implementation in a finite element (FE) program to evaluate the mechanical effects induced by the propagation of a frost front in a pavement. This novel program handles the coupling between the thermoviscoelastic problem with swelling in AC materials and the heat equation with phase change. First applied to the modelling of characterization tests on partially saturated AC specimens, the developed program has proved to be relevant. Then, to get closer to onsite conditions, an original frost-thaw test was carried out on a bilayer AC structure partially saturated. The test led to the delamination of the two layers during the second frost-thaw cycle. Its modelling showed that the interface rupture was triggered by differential strains and self-stress fields developing in the sample. These results can provide an explanation to the initialisation of the pothole issue.