基于虚拟劈裂试验的集料椭球表面基构造  

Aggregate ellipsoidal surface base reconstruction with virtual splitting tests

作　　者：杨彦海[1] 李百川 杨野[1,2] 王崇骅 岳靓 YANG Yan-hai;LI Bai-chuan;YANG Ye;WANG Chong-hua;YUE Liang(School of Transportation and Geomatics Engineering,Shengyang Jianzhu University,Shenyang 110168,China;College of Transportation Engineering,Dalian Maritime University,Dalian 116026,China)

机构地区：[1]沈阳建筑大学交通与测绘工程学院,沈阳110168 [2]大连海事大学交通运输工程学院,辽宁大连116026

出　　处：《吉林大学学报(工学版)》2025年第2期653-663,共11页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(52278454)。

摘　　要：为探究骨料细观结构对沥青混合料宏观性能的影响,利用工业CT技术,提出采用二次形状参数长宽比、宽高比来表征真实集料。以二次形状参数为基础使用椭球表面基重构集料,在PFC3D中利用伺服原理生成试件进行劈裂试验。结果表明:当长宽比取值为1.5、宽高比取值为0.98时,棱角性集料模型准确性最高;棱角性集料重构时,长宽比应避免超过2.0;针状集料阻碍集料稳定骨架的形成,片状集料使混合料中心受拉并不明显;良好棱角性的集料有助于提升抗拉性能。基于椭球表面基构造的重构方式是一种精确高效的建模方法。To explore the effect of mesoscale structure of aggregates in asphalt mixtures on the macroscopicproperties,the secondary shape parameters length-width ratio and width-thickness ratio were used tocharacterise the real aggregates was proposed in this paper using X-ray CT.On the basis of the secondaryshape parameters,the aggregate was reconstructed used an ellipsoidal surface base,the specimens wasgenerated for splitting tests in PFC3D using the servo control.The results show that the angularityaggregates model had the highest accuracy when the length-width ratio was taken as 1.5 and the width-thickness ratio was taken as 0.98.In the reconstruction of angularity aggregates,the length-width ratioshould avoid exceeding 2.0.Elongate aggregates hindered the formation of a stable aggregate skeleton,flataggregates made the tension in the centre of the mixture not obvious.Well angularity aggregates improvedthe tensile properties.The ellipsoidal surface based of the aggregate reconstruction method was an accurateand efficient modelling method.

关 键 词：道路工程 沥青混合料 工业CT 离散元 随机骨料 细观尺度 

分 类 号：U414[交通运输工程—道路与铁道工程]