Zhang Dong, Wu Chunying, Cai Lili, Bian Jiang, Yin Chaoen
College of Transportation Engineering, Nanjing Tech University, Nanjing 211816, China.
Nanjing Ningtong Intelligent Transportation Technology Research Institute Co., Ltd., Nanjing 211135, China.
Materials (Basel). 2022 Nov 5;15(21):7808. doi: 10.3390/ma15217808.
Numerical simulation is an effective way to study the mechanical response of asphalt pavement, which is very important for the pavement structural design. In this study, a three-dimensional meso-structure discrete element model of asphalt pavement was generated with the FISH programming language and its meso-mechanical response under vehicle load was analyzed. The contact forces within the asphalt pavement, in asphalt mastic, in coarse aggregates and between asphalt mastic and coarse aggregates were studied. The results of the study show that the contact forces within the asphalt mixture are highly uneven. The number of contact points in coarse aggregates account only for about 10% of all contact points while the sum of the contact forces in coarse aggregates contributes to over 50% of all contact forces. This demonstrates that the coarse aggregates bear most of the vehicle load. The average normal contact force in coarse aggregates is about 5 N and the average tangential contact force in coarse aggregates is about 2 N. The modeling results provide a quantitative understanding of the distribution of loading in asphalt pavement.
数值模拟是研究沥青路面力学响应的有效方法，这对路面结构设计非常重要。在本研究中，用FISH编程语言建立了沥青路面的三维细观结构离散元模型，并分析了其在车辆荷载作用下的细观力学响应。研究了沥青路面内部、玛蹄脂、粗集料内部以及玛蹄脂与粗集料之间的接触力。研究结果表明，沥青混合料内部的接触力极不均匀。粗集料中的接触点数量仅占所有接触点的约10%，而粗集料中接触力的总和占所有接触力的50%以上。这表明粗集料承受了大部分车辆荷载。粗集料中的平均法向接触力约为5 N，粗集料中的平均切向接触力约为2 N。建模结果为定量了解沥青路面的荷载分布提供了依据。
