Influence of synthetic inclusions on the degradation and deformation of ballast under heavy-haul cyclic loading

Ngo, T; Indraratna, B; Ferreira, F

Influence of synthetic inclusions on the degradation and deformation of ballast under heavy-haul cyclic loading

Ngo, T Indraratna, B

Ferreira, F

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Publisher:: TAYLOR & FRANCIS LTD
Publication Type:: Journal Article
Citation:: International Journal of Rail Transportation, 2021
Issue Date:: 2021-01-01

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Field	Value	Language
dc.contributor.author	Ngo, T
dc.contributor.author	Indraratna, B https://orcid.org/0000-0002-9057-1514
dc.contributor.author	Ferreira, F
dc.date.accessioned	2022-04-27T23:57:16Z
dc.date.available	2022-04-27T23:57:16Z
dc.date.issued	2021-01-01
dc.identifier.citation	International Journal of Rail Transportation, 2021
dc.identifier.issn	2324-8378
dc.identifier.issn	2324-8386
dc.identifier.uri	http://hdl.handle.net/10453/156716
dc.description.abstract	This study investigates the benefits of artificial inclusions placed underneath the ballast layer. A series of large-scale cyclic triaxial tests were carried out on ballast with and without these inclusions under 25-tonne and 35-tonne axle loads and frequencies of f = 15 Hz and 25 Hz, using a Process Simulation Prismoidal Triaxial Apparatus. The laboratory results show that a geogrid installed between the ballast and capping layer decreases both deformation and degradation of the aggregates, which can be attributed to enhanced internal confinement and restricted particle movement. Laboratory tests also showed that placing a rubber mat underneath the ballast layer significantly reduced ballast breakage. A numerical model using the discrete element method (DEM) was developed and validated against the experimental observations. The DEM model was utilized to explore the contact forces that developed across the granular assemblies, and to study the interaction between aggregates and the synthetic inclusions from a particle-level perspective.
dc.language	English
dc.publisher	TAYLOR & FRANCIS LTD
dc.relation	http://purl.org/au-research/grants/arc/IC170100006
dc.relation.ispartof	International Journal of Rail Transportation
dc.relation.isbasedon	10.1080/23248378.2021.1964390
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.rights	This is an Accepted Manuscript of an article published by Taylor & Francis in International Journal of Rail Transportation On: 01 Jan 2022 Available online: https://doi.org/10.1080/23248378.2021.1964390
dc.subject	0905 Civil Engineering, 0913 Mechanical Engineering
dc.title	Influence of synthetic inclusions on the degradation and deformation of ballast under heavy-haul cyclic loading
dc.type	Journal Article
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	2023-01-01T00:00:00+1000Z
dc.date.updated	2022-04-27T23:56:44Z
pubs.publication-status	Published

Abstract:

This study investigates the benefits of artificial inclusions placed underneath the ballast layer. A series of large-scale cyclic triaxial tests were carried out on ballast with and without these inclusions under 25-tonne and 35-tonne axle loads and frequencies of f = 15 Hz and 25 Hz, using a Process Simulation Prismoidal Triaxial Apparatus. The laboratory results show that a geogrid installed between the ballast and capping layer decreases both deformation and degradation of the aggregates, which can be attributed to enhanced internal confinement and restricted particle movement. Laboratory tests also showed that placing a rubber mat underneath the ballast layer significantly reduced ballast breakage. A numerical model using the discrete element method (DEM) was developed and validated against the experimental observations. The DEM model was utilized to explore the contact forces that developed across the granular assemblies, and to study the interaction between aggregates and the synthetic inclusions from a particle-level perspective.

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http://hdl.handle.net/10453/156716