Use of Geogrid for Improved Performance of Ballasted Tracks: Experimental and DEM Approaches

Ngo, T; Indraratna, B

Use of Geogrid for Improved Performance of Ballasted Tracks: Experimental and DEM Approaches

Ngo, T Indraratna, B

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Publisher:: Springer Science and Business Media LLC
Publication Type:: Journal Article
Citation:: International Journal of Geosynthetics and Ground Engineering, 2024, 10, (3)
Issue Date:: 2024-06-01

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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.date.accessioned	2024-05-10T03:25:12Z
dc.date.available	2024-05-10T03:25:12Z
dc.date.issued	2024-06-01
dc.identifier.citation	International Journal of Geosynthetics and Ground Engineering, 2024, 10, (3)
dc.identifier.issn	2199-9260
dc.identifier.issn	2199-9279
dc.identifier.uri	http://hdl.handle.net/10453/178791
dc.description.abstract	This paper presents a study on the enhanced performance of ballasted tracks through the implementation of geogrids. A series of large-scale direct shear tests and impact tests was conducted with three distinct types of geogrids. The behavior of ballast was evaluated in terms of shear stress–strain responses and stress concentration using stress sensing sheets. Additionally, a micromechanical analysis utilizing the discrete element method was simulated on ballast assemblies with different geogrid reinforcements. The shear stress–strain responses of ballast simulated from DEM are comparable with those measured from large-scale direct shear tests, indicating that the inclusion of geogrid can enhance the performance of ballast by increasing its shear strength, as well as reducing the vertical displacement and the load distribution with depth. Micromechanical analysis was performed to investigate the influences of geogrids on contact force distribution, coordination number and orientation of contact which could not be captured in a laboratory environment. The use of geogrids in ballasted tracks certainly shows promise for sustainable and efficient railway infrastructure, as evidenced by the experimental and DEM-based findings, offering valuable insights into optimizing track stability and longevity.
dc.language	en
dc.publisher	Springer Science and Business Media LLC
dc.relation	http://purl.org/au-research/grants/arc/DP220102862
dc.relation	http://purl.org/au-research/grants/arc/IC170100006
dc.relation.ispartof	International Journal of Geosynthetics and Ground Engineering
dc.relation.isbasedon	10.1007/s40891-024-00538-2
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0905 Civil Engineering
dc.subject.classification	4005 Civil engineering
dc.title	Use of Geogrid for Improved Performance of Ballasted Tracks: Experimental and DEM Approaches
dc.type	Journal Article
utslib.citation.volume	10
utslib.for	0905 Civil 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	*
dc.date.updated	2024-05-10T03:25:05Z
pubs.issue	3
pubs.publication-status	Accepted
pubs.volume	10
utslib.citation.issue	3

Abstract:

This paper presents a study on the enhanced performance of ballasted tracks through the implementation of geogrids. A series of large-scale direct shear tests and impact tests was conducted with three distinct types of geogrids. The behavior of ballast was evaluated in terms of shear stress–strain responses and stress concentration using stress sensing sheets. Additionally, a micromechanical analysis utilizing the discrete element method was simulated on ballast assemblies with different geogrid reinforcements. The shear stress–strain responses of ballast simulated from DEM are comparable with those measured from large-scale direct shear tests, indicating that the inclusion of geogrid can enhance the performance of ballast by increasing its shear strength, as well as reducing the vertical displacement and the load distribution with depth. Micromechanical analysis was performed to investigate the influences of geogrids on contact force distribution, coordination number and orientation of contact which could not be captured in a laboratory environment. The use of geogrids in ballasted tracks certainly shows promise for sustainable and efficient railway infrastructure, as evidenced by the experimental and DEM-based findings, offering valuable insights into optimizing track stability and longevity.

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http://hdl.handle.net/10453/178791