Mechanical response analysis of asphalt pavement considering top-down crack based on FDM-DEM coupling simulation

Min Wang , Xin Yu , Chen Chen
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Abstract

The occurrence of top-down (TD) cracking has gradually become a prevalent issue in semi-rigid base asphalt pavements after prolonged service. A coupled simulation model integrating the finite difference method (FDM) and discrete element method (DEM) was employed to investigate the mechanical behavior of asphalt pavement containing a pre-existing TD crack. The mesoscopic parameters of the model were calibrated based on the mixture modulus and the static mechanical response on the MLS66 test road. Finally, an analysis was performed to assess how variations in TD crack depth and longitudinal length affect the distribution patterns of transverse tensile stress, vertical shear stress, and vertical compressive stress. The results indicate that the vertical propagation of TD crack significantly increases both the tensile stress value and range on the middle surface, while the longitudinal development of TD crack has minimal impact. This phenomenon may result in more severe fatigue failure on the middle surface. With the vertical and longitudinal development of TD crack, the vertical shear stress and compressive stress show obvious "two-stage" characteristics. When the crack's vertical length reaches 40 ​mm, there is a sharp increase in stress on the upper surface. As the crack continues to propagate vertically, the growth of stress on the upper surface becomes negligible, while the stress in the middle and lower layers increased significantly. Conversely, for longitudinal development of TD crack, any changes in stress are insignificant when their length is less than 180 ​mm; however, as they continue to develop longitudinally beyond this threshold, there is a sharp increase in stress levels. These findings hold great significance for understanding pavement structure deterioration and maintenance behavior associated with TD crack.
基于FDM-DEM耦合仿真的考虑自上而下裂缝的沥青路面力学响应分析
半刚性基层沥青路面在长期使用后,自顶开裂已逐渐成为普遍存在的问题。采用有限差分法(FDM)和离散元法(DEM)相结合的耦合仿真模型,研究了含TD裂缝沥青路面的力学行为。基于混合料模量和MLS66试验路面的静态力学响应,对模型的细观参数进行了标定。最后,分析了TD裂缝深度和纵向长度的变化对横向拉应力、垂直剪应力和垂直压应力分布规律的影响。结果表明:纵向裂纹的扩展显著增加了中间表面的拉应力值和范围,而纵向裂纹的扩展对中间表面的拉应力影响较小;这种现象可能导致中间表面更严重的疲劳破坏。随着TD裂缝纵向和纵向的发展,竖向剪应力和压应力表现出明显的“两阶段”特征。当裂缝垂直长度达到40 mm时,上表面应力急剧增大。随着裂纹继续垂直扩展,上表面应力的增长可以忽略不计,而中下层应力的增长则显著增加。相反,对于TD裂纹的纵向发展,当其长度小于180 mm时,应力变化不显著;然而,随着他们继续纵向发展超过这个阈值,压力水平急剧增加。这些研究结果对于理解路面结构退化与养护行为与TD裂缝的关系具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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