Numerical Modelling of Track Behavior Capturing Particle Breakage under Dynamic Loading

Ngo, T; Indraratna, B

Numerical Modelling of Track Behavior Capturing Particle Breakage under Dynamic Loading

Ngo, T Indraratna, B

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Publisher:: AMER SOC CIVIL ENGINEERS
Publication Type:: Conference Proceeding
Citation:: Geotechnical Special Publication, 2020, 2020-February, (GSP 316), pp. 374-382
Issue Date:: 2020-01-01

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	Front matter_GeoCongress 2020-GSP 316-Geotechnical Infrastructure.pdf	Published version	1.43 MB	Adobe PDF	View/Open
	Numerical Modelling of Track Behavior Capturing Particle Breakage under Dynamic Loading.pdf	Published version	1.46 MB	Adobe PDF	View/Open

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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.editor	Hambleton, JP
dc.contributor.editor	Makhnenko, R
dc.contributor.editor	Budge, AS
dc.date	2020-02-25
dc.date.accessioned	2021-02-26T04:51:27Z
dc.date.available	2021-02-26T04:51:27Z
dc.date.issued	2020-01-01
dc.identifier.citation	Geotechnical Special Publication, 2020, 2020-February, (GSP 316), pp. 374-382
dc.identifier.issn	0895-0563
dc.identifier.uri	http://hdl.handle.net/10453/146484
dc.description.abstract	© 2020 American Society of Civil Engineers. This paper presents a study on ballasted track behavior, capturing particle breakage under dynamic loading using large-scale laboratory testing, supplemented with computational modeling approaches. Four large-scale triaxial tests are conducted to investigate the ballast breakage responses subjected to cyclic loading subjected to varying frequencies, f=10-40Hz. Measured laboratory observations show that an increase in loading frequency and magnitude results in significantly increased degradation (breakage) and deformation of ballast. Computational modeling using a coupled discrete-continuum approach (coupled DEM-FEM) is introduced to provide insightful understanding of the deformation and breaking of ballast under cyclic loading. Discrete ballast grains are simulated by bonding of many cylinders together at appropriate sizes and locations. Selected elements located at corners, surfaces, and sharp edges of the simulated particles are connected by parallel bonds; and when those bonds are broken, they are considered to represent ballast breakage. The predicted axial strain ϵa, volumetric strain ϵv obtained from the coupled DEM-FEM model agree reasonably well with those observed experimentally. The coupled model is then used to investigate micromechanical aspects of ballast aggregates including the evolution of particle breakage, contact force distributions, and orientation of contacts during cyclic loading.
dc.language	en
dc.publisher	AMER SOC CIVIL ENGINEERS
dc.relation	http://purl.org/au-research/grants/arc/IC170100006
dc.relation.ispartof	Geotechnical Special Publication
dc.relation.ispartof	2nd Session on Engineering, Monitoring, and Management of Geotechnical Infrastructure at Geo-Congress on Vision, Insight, Outlook
dc.relation.ispartofseries	Geotechnical Special Publication
dc.relation.isbasedon	10.1061/9780784482797.037
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Geological & Geomatics Engineering
dc.title	Numerical Modelling of Track Behavior Capturing Particle Breakage under Dynamic Loading
dc.type	Conference Proceeding
utslib.citation.volume	2020-February
utslib.location.activity	Minneapolis, MN
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
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	closed_access	*
dc.date.updated	2021-02-26T04:51:18Z
pubs.finish-date	2020-02-28
pubs.issue	GSP 316
pubs.publication-status	Published
pubs.start-date	2020-02-25
pubs.volume	2020-February
utslib.citation.issue	GSP 316

Abstract:

© 2020 American Society of Civil Engineers. This paper presents a study on ballasted track behavior, capturing particle breakage under dynamic loading using large-scale laboratory testing, supplemented with computational modeling approaches. Four large-scale triaxial tests are conducted to investigate the ballast breakage responses subjected to cyclic loading subjected to varying frequencies, f=10-40Hz. Measured laboratory observations show that an increase in loading frequency and magnitude results in significantly increased degradation (breakage) and deformation of ballast. Computational modeling using a coupled discrete-continuum approach (coupled DEM-FEM) is introduced to provide insightful understanding of the deformation and breaking of ballast under cyclic loading. Discrete ballast grains are simulated by bonding of many cylinders together at appropriate sizes and locations. Selected elements located at corners, surfaces, and sharp edges of the simulated particles are connected by parallel bonds; and when those bonds are broken, they are considered to represent ballast breakage. The predicted axial strain ϵa, volumetric strain ϵv obtained from the coupled DEM-FEM model agree reasonably well with those observed experimentally. The coupled model is then used to investigate micromechanical aspects of ballast aggregates including the evolution of particle breakage, contact force distributions, and orientation of contacts during cyclic loading.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/146484