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

Abstract

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

CLC Number:

U416.2

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

Mesoscale simulation of cracking behavior of asphalt mixture considering heterogeneity

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