Abstract

Three digital specimens of asphalt mixtures (AC-13, SMA-13 and OGFC-13) were reconstructed to conduct a virtual simple performance test using the discrete element method. The distribution characteristics of force chains were investigated by a statistical method. The results indicate that it is reasonable and feasible to analyze the mesoscopic responses of asphalt mixtures using digital models. The probability distribution of the normal force chains varies with loading time and the variation laws are consistent at four loading times. And the probability distribution of the shear force chains decays exponentially. Besides, the maximum probability distributions of the normal and shear force chains decrease with increasing timestep. OGFC-13 has the maximum probability distributions of the normal and shear force chains, which are 0.34186 and 0.55884, respectively. The proportions of the “strong” force chains decrease over the loading time, and AC-13 has a maximum proportion of 49.41% for the three asphalt mixtures at four loading times. In addition, the angle distributions of the force chain are mainly near 90°, and the average ratio of the normal contact force to the mean normal contact force increases with increasing loading time at 90°. Finally, the angle distribution proportions in the first and second quadrants are much greater than those in the third and fourth quadrants.

Graphic abstract

中文翻译：

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三种骨架结构沥青混合料力链定量分布特性的离散元法

摘要

重建了三个沥青混合料的数字标本（AC-13，SMA-13和OGFC-13），以使用离散元方法进行虚拟的简单性能测试。通过统计方法研究了力链的分布特性。结果表明，采用数字模型分析沥青混合料的介观响应是合理可行的。法向力链的概率分布随加载时间而变化，并且在四个加载时间处变化规律是一致的。剪力链的概率分布呈指数衰减。此外，法向力链和剪力链的最大概率分布随时间步长的增加而减小。OGFC-13在法向力链和剪切力链中具有最大概率分布，分别为0.34186和0.55884，分别。“强”力链的比例在加载时间内会降低，对于三种沥青混合物，在四个加载时间下，AC-13的最大比例为49.41％。此外，力链的角度分布主要在90°附近，法向接触力与平均法向接触力的平均比率随90°加载时间的增加而增加。最后，第一象限和第二象限中的角度分布比例远大于第三象限和第四象限中的角度分布比例。法向接触力与平均法向接触力的平均比率随90°加载时间的增加而增加。最后，第一象限和第二象限中的角度分布比例远大于第三象限和第四象限中的角度分布比例。法向接触力与平均法向接触力的平均比率随90°加载时间的增加而增加。最后，第一象限和第二象限中的角度分布比例远大于第三象限和第四象限中的角度分布比例。

图形摘要