Stress-dilatancy behaviour of fouled ballast: experiments and DEM modelling

Chen, J; Indraratna, B; Vinod, JS; Ngo, NT; Gao, R; Liu, Y

Stress-dilatancy behaviour of fouled ballast: experiments and DEM modelling

Chen, J Indraratna, B

Vinod, JS Ngo, NT Gao, R Liu, Y

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Publisher:: SPRINGER
Publication Type:: Journal Article
Citation:: Granular Matter, 2021, 23, (4)
Issue Date:: 2021-11-01

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Field	Value	Language
dc.contributor.author	Chen, J
dc.contributor.author	Indraratna, B https://orcid.org/0000-0002-9057-1514
dc.contributor.author	Vinod, JS
dc.contributor.author	Ngo, NT
dc.contributor.author	Gao, R
dc.contributor.author	Liu, Y
dc.date.accessioned	2022-04-27T09:12:42Z
dc.date.available	2022-04-27T09:12:42Z
dc.date.issued	2021-11-01
dc.identifier.citation	Granular Matter, 2021, 23, (4)
dc.identifier.issn	1434-5021
dc.identifier.issn	1434-7636
dc.identifier.uri	http://hdl.handle.net/10453/156680
dc.description.abstract	This paper presents a study of the mechanical behaviour of ballast contaminated by different fouling agents such as coal and subgrade clay. Large-scale direct shear tests were carried out to examine the strength and deformation properties for coal-fouled and clay-fouled ballast. The experimental results show that fouled ballast (both clay and coal) exhibits a lower peak shear strength and decreased dilation during shearing. The clay-fouled ballast shows higher shear strength and smaller dilation compared to coal-fouled ballast. The relationship between shear stress and dilatancy of ballast under different fouling conditions is reported in this paper, where the numerical predictions are made using the discrete element method (DEM). The DEM simulations show that with the increase of fouling level, the coordination number, the average contact force, the particle rotation and the velocity decrease for ballast aggregates. The results indicate that coal-fouled ballast exhibits a smaller average contact forces with less stress concentrations, less major principal stress orientation and a greater coordination number, leading to less particle rotation and velocity compared to those of clay-fouled ballast for the same degree of fouling. Graphic abstract: [Figure not available: see fulltext.]
dc.language	English
dc.publisher	SPRINGER
dc.relation	http://purl.org/au-research/grants/arc/IC170100006
dc.relation.ispartof	Granular Matter
dc.relation.isbasedon	10.1007/s10035-021-01150-1
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.rights	This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections.
dc.subject	0904 Chemical Engineering, 0905 Civil Engineering, 0913 Mechanical Engineering
dc.subject.classification	Fluids & Plasmas
dc.title	Stress-dilatancy behaviour of fouled ballast: experiments and DEM modelling
dc.type	Journal Article
utslib.citation.volume	23
utslib.for	0904 Chemical Engineering
utslib.for	0905 Civil Engineering
utslib.for	0913 Mechanical Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
utslib.copyright.status	open_access	*
utslib.copyright.embargo	2022-11-01T00:00:00+1000Z
dc.date.updated	2022-04-27T09:12:32Z
pubs.issue	4
pubs.publication-status	Published
pubs.volume	23
utslib.citation.issue	4

Abstract:

This paper presents a study of the mechanical behaviour of ballast contaminated by different fouling agents such as coal and subgrade clay. Large-scale direct shear tests were carried out to examine the strength and deformation properties for coal-fouled and clay-fouled ballast. The experimental results show that fouled ballast (both clay and coal) exhibits a lower peak shear strength and decreased dilation during shearing. The clay-fouled ballast shows higher shear strength and smaller dilation compared to coal-fouled ballast. The relationship between shear stress and dilatancy of ballast under different fouling conditions is reported in this paper, where the numerical predictions are made using the discrete element method (DEM). The DEM simulations show that with the increase of fouling level, the coordination number, the average contact force, the particle rotation and the velocity decrease for ballast aggregates. The results indicate that coal-fouled ballast exhibits a smaller average contact forces with less stress concentrations, less major principal stress orientation and a greater coordination number, leading to less particle rotation and velocity compared to those of clay-fouled ballast for the same degree of fouling. Graphic abstract: [Figure not available: see fulltext.]

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http://hdl.handle.net/10453/156680