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Evolution of clogging of porous asphalt concrete in the seepage process through integration of computer tomography, computational fluid dynamics, and discrete element method
Computer-Aided Civil and Infrastructure Engineering ( IF 8.5 ) Pub Date : 2025-01-08 , DOI: 10.1111/mice.13419
Bo Li, Yunpeng Zhang, Dingbang Wei, Tengfei Yao, Yongping Hu, Hui Dou

The longevity of porous asphalt pavement is inevitably compromised by the clogging of voids by various particles, leading to a degradation in its drainage function. Numerical simulations with real pore structures were used to investigate the clogging behavior of porous asphalt concrete (PAC) to clearly and intuitively understand its void clogging process. In this study, a three‐dimensional model of the real void was created by computed tomography scanning. The change before and after void clogging of PAC was characterized by seepage pressure and seepage velocity in the seepage field. The computational fluid dynamics‐discrete element method coupling method was used to visually describe the dynamic evolution of clogging particles in porous asphalt voids. Findings reveal that the most influential particle size for clogging in PAC‐13 with 18% and 20% porosity ranged between 0.15 and 0.6 mm. In contrast, for PAC‐13 with 25% porosity, the sensitive size was 0.3–1.18 mm. When clogging occurred, large particles predominantly obstructed the void inlets, prompting a refinement in the void structure. Subsequent particles either traversed the void, accumulating at the entrances of finer voids, or filled up progressively, leading to eventual clogging. Small particles either exited directly through the voids or accumulated in the bends of the voids, making the voids clogged directly. Consequently, the clogging behavior of porous asphalt was classified into three types: surface‐filling clogging, void refining filter clogging, and void bending or semi‐connecting clogging. These findings provide a scientific basis for optimizing PAC design and developing conservation strategies.

中文翻译:


通过集成计算机断层扫描、计算流体动力学和离散元方法,研究渗流过程中多孔沥青混凝土堵塞的演变



多孔沥青路面的使用寿命不可避免地会受到各种颗粒堵塞空隙的影响,导致其排水功能退化。使用具有真实孔隙结构的数值模拟来研究多孔沥青混凝土 (PAC) 的堵塞行为,以清晰直观地了解其空隙堵塞过程。在这项研究中,通过计算机断层扫描创建了真实空隙的三维模型。PAC 空洞堵塞前后的变化表现为渗流场内的渗流压力和渗流速度。计算流体动力学-离散元法耦合方法用于直观地描述多孔沥青空隙中堵塞颗粒的动态演变。研究结果表明,在 PAC-13 中,孔隙率为 18% 和 20% 时,对堵塞影响最大的粒径在 0.15 到 0.6 毫米之间。相比之下,对于孔隙率为 25% 的 PAC-13,敏感尺寸为 0.3-1.18 mm。当堵塞发生时,大颗粒主要阻塞空隙入口,促使空隙结构的细化。随后的颗粒要么穿过空隙,在较细的空隙入口处积累,要么逐渐填充,最终导致堵塞。小颗粒要么直接从空隙中流出,要么积聚在空隙的弯曲处,使空隙直接堵塞。因此,多孔沥青的堵塞行为分为三种类型:表面填充堵塞、空隙细化过滤器堵塞和空隙弯曲或半连接堵塞。这些发现为优化 PAC 设计和制定保护策略提供了科学依据。
更新日期:2025-01-08
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