基于虚拟劈裂试验的集料椭球表面基构造

doi:10.13229/j.cnki.jdxbgxb.20230510

摘要/Abstract

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。

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

Abstract:

To explore the effect of mesoscale structure of aggregates in asphalt mixtures on the macroscopic properties， the secondary shape parameters length-width ratio and width-thickness ratio were used to characterise the real aggregates was proposed in this paper using X-ray CT. On the basis of the secondary shape parameters， the aggregate was reconstructed used an ellipsoidal surface base， the specimens was generated for splitting tests in PFC3D using the servo control. The results show that the angularity aggregates 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 ratio should avoid exceeding 2.0. Elongate aggregates hindered the formation of a stable aggregate skeleton， flat aggregates made the tension in the centre of the mixture not obvious. Well angularity aggregates improved the tensile properties. The ellipsoidal surface based of the aggregate reconstruction method was an accurate and efficient modelling method.

Key words: road engineering, asphalt mixture, X-ray CT, discrete element method, random aggregate, mesoscale

中图分类号:

U414

杨彦海,李百川,杨野,王崇骅,岳靓. 基于虚拟劈裂试验的集料椭球表面基构造[J]. 吉林大学学报(工学版), 2025, 55(2): 653-663.

Yan-hai YANG,Bai-chuan LI,Ye YANG,Chong-hua WANG,Liang YUE. Aggregate ellipsoidal surface base reconstruction with virtual splitting tests[J]. Journal of Jilin University(Engineering and Technology Edition), 2025, 55(2): 653-663.

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宏观模型	细观参数	符号	取值
集料-集料	线性粘结模量	cb_emod	2×10⁶
	摩擦系数	μ	0.5
	刚度比	kratio	2.4
集料-砂浆	平行黏结模量	pb_emod	1×10⁸
	抗拉强度	pb_ten	6×10⁶
	粘结力	pb_coh	5×10⁶
	摩擦系数	μ	0.5
	平行粘结半径	r	1.2×10^-3
砂浆	平行粘结模量	pb_emod	7.5×10⁷
	抗拉强度	pb_ten	4.5×10⁶
	粘结力	pb_coh	3.75×10⁶
	摩擦系数	μ	0.5
	平行粘结半径	r	1.2×10^-3

项目	长宽比			宽高比
项目	1.3	1.5	1.74	0.6	0.8	0.98
模拟试验/MPa	1.15	1.00	0.99	0.98	0.73	0.99
室内试验强度均值/MPa	1.051
误差/%	9.4	5.1	5.8	7.2	43.9	6.1

项目	Clump替换	导入平衡	伺服平衡	加胶结
椭球重构	7.5s	2m15s	5h24m10s	2m29s
真实骨料	3m12s	2m46s	5h41m47s	3m10s
效率提升/%	2560	23.0	5.4	27.5

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