考虑非均匀性的沥青混合料开裂行为细观模拟

doi:10.13229/j.cnki.jdxbgxb.20220876

摘要/Abstract

摘要：

为探究沥青混合料内部非均匀性对其开裂行为的影响，通过室内试验获取有限元模型所需参数；使用插件实现骨料随机投放，并分别在骨料-砂浆界面处和沥青砂浆单元间插入内聚力单元，基于内聚力模型对细观尺度下沥青混合料中裂缝的萌生、扩展和失效全过程进行模拟；探讨了骨料物理力学性质和界面黏结强度对沥青混合料抵抗拉伸开裂性能的影响。本文研究成果可为沥青混合料的设计提供理论和数据支撑。

关键词: 道路工程, 沥青混合料, 细观尺度, 内聚力模型, 开裂行为, 非均匀性

Abstract:

To explore the influence of the internal heterogeneity of asphalt mixture on its cracking behavior， the required parameters for the finite element model were obtained through laboratory tests. The aggregates were randomly placed using plug-ins， and cohesion units were inserted at the aggregate-mortar interface and between asphalt mortar units， respectively. Thus， the entire process of crack initiation， propagation， and failure in asphalt mixture was simulated based on the cohesive zone model. The extent to which the physico-mechanical properties of aggregates and the interface adhesion influence the tensile cracking resistance of asphalt mixture was discussed. The research results provide theoretical and data support for the design of asphalt mixture.

Key words: pavement engineering, asphalt mixtures, mesoscale, cohesive zone model, cracking behavior, heterogeneity

中图分类号:

U416.2

孙雅珍,薛博欣,孙岩,王志臣,潘嘉伟. 考虑非均匀性的沥青混合料开裂行为细观模拟[J]. 吉林大学学报(工学版), 2024, 54(6): 1708-1718.

Ya-zhen SUN,Bo-xin XUE,Yan SUN,Zhi-chen WANG,Jia-wei PAN. Mesoscale simulation of cracking behavior of asphalt mixture considering heterogeneity[J]. Journal of Jilin University(Engineering and Technology Edition), 2024, 54(6): 1708-1718.

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材料	筛孔尺寸/mm
材料	16	13.2	9.5	4.75	2.36	1.18	0.5	0.3	0.15	0.075
沥青混合料	100	95	76.5	53	37	26.5	19	13.5	10	5
沥青砂浆	100	100	100	100	69.6	49.8	35.7	25.4	18.8	9.4

	沥青砂浆	骨料	骨料-砂浆界面
弹性模量E /MPa	200	55 000	—
泊松比	0.3	0.25	—
抗拉强度/MPa	1.60	—	0.23
抗剪强度/MPa	1.34	—	—
拉伸刚度K_nn/［10¹²（Pa·m^-1）］	1.036	—	1.332
剪切刚度K_tt/［10¹¹（Pa·m^-1）］	0.847	—	—
破坏位移U/mm	1.825	—	1.7

参数	筛孔尺寸/mm
参数	16	13.2	9.5	4.75	2.36	1.18	0.5	0.3	0.15	0.075
级配上限	100	100	85	68	50	38	28	20	15	5
级配下限	100	90	68	38	24	15	10	7	5	3