Influence of varying water content on permanent deformation of mud-fouled ballast

Nguyen, TT; Indraratna, B

Influence of varying water content on permanent deformation of mud-fouled ballast

Nguyen, TT Indraratna, B

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Transportation Geotechnics, 2023, 38, pp. 100919
Issue Date:: 2023-01-01

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Field	Value	Language
dc.contributor.author	Nguyen, TT
dc.contributor.author	Indraratna, B https://orcid.org/0000-0002-2346-8250
dc.date.accessioned	2023-05-09T13:21:14Z
dc.date.available	2023-05-09T13:21:14Z
dc.date.issued	2023-01-01
dc.identifier.citation	Transportation Geotechnics, 2023, 38, pp. 100919
dc.identifier.issn	2214-3912
dc.identifier.issn	2214-3912
dc.identifier.uri	http://hdl.handle.net/10453/170292
dc.description.abstract	The contamination of ballast by mud pumping is known to cause considerable reduction in the shear resistance as well as increased settlement of railroad foundations. However, how varying water content (w) of fouled ballast can affect this deterioration has not been properly understood. The current study thus adopts a large-scale cyclic triaxial test to examine permanent (plastic) deformation of mud-fouled ballast collected from a site with a history of mud pumping with a consideration of different water contents. In these tests, fouling content varies from 5 to 30 %, while the water content changes from 0 to 40 %. The results show that while increasing content of fines causes larger permanent settlement of ballast, varying water content of fines can influence this behaviour significantly. A salient finding of this study is the critical threshold of water content near to the liquid limit (LL) of fine soil (finer than 0.425 mm) that can cause a swift increase in ballast settlement. The results show that the peak permanent strain can increase by about 26 % compared to the dry state when w of fines reaches the LL. On the other hand, permanent strain of fouled ballast can decrease at the optimum water content of fines, if a sufficient mass of fines (>20 % by weight) is provided to reinforce the granular assembly. An empirical method is provided to estimate the ultimate settlement of mud-fouled tracks considering the moisture state that would be most beneficial in real-life applications.
dc.language	en
dc.publisher	Elsevier
dc.relation	http://purl.org/au-research/grants/arc/LP160101254
dc.relation.ispartof	Transportation Geotechnics
dc.relation.isbasedon	10.1016/j.trgeo.2022.100919
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject	0905 Civil Engineering
dc.title	Influence of varying water content on permanent deformation of mud-fouled ballast
dc.type	Journal Article
utslib.citation.volume	38
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	embargoed	*
utslib.copyright.embargo	2025-01-01T00:00:00+1000Z
dc.date.updated	2023-05-09T13:21:13Z
pubs.publication-status	Published
pubs.volume	38

Abstract:

The contamination of ballast by mud pumping is known to cause considerable reduction in the shear resistance as well as increased settlement of railroad foundations. However, how varying water content (w) of fouled ballast can affect this deterioration has not been properly understood. The current study thus adopts a large-scale cyclic triaxial test to examine permanent (plastic) deformation of mud-fouled ballast collected from a site with a history of mud pumping with a consideration of different water contents. In these tests, fouling content varies from 5 to 30 %, while the water content changes from 0 to 40 %. The results show that while increasing content of fines causes larger permanent settlement of ballast, varying water content of fines can influence this behaviour significantly. A salient finding of this study is the critical threshold of water content near to the liquid limit (LL) of fine soil (finer than 0.425 mm) that can cause a swift increase in ballast settlement. The results show that the peak permanent strain can increase by about 26 % compared to the dry state when w of fines reaches the LL. On the other hand, permanent strain of fouled ballast can decrease at the optimum water content of fines, if a sufficient mass of fines (>20 % by weight) is provided to reinforce the granular assembly. An empirical method is provided to estimate the ultimate settlement of mud-fouled tracks considering the moisture state that would be most beneficial in real-life applications.

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http://hdl.handle.net/10453/170292