Laboratory study on subgrade fluidization under undrained cyclic triaxial loading

Indraratna, B; Singh, M; Thanh, TN; Leroueil, S; Abeywickrama, A; Kelly, R; Neville, T

Laboratory study on subgrade fluidization under undrained cyclic triaxial loading

Indraratna, B

Singh, M Thanh, TN Leroueil, S Abeywickrama, A Kelly, R Neville, T

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Publisher:: CANADIAN SCIENCE PUBLISHING
Publication Type:: Journal Article
Citation:: CANADIAN GEOTECHNICAL JOURNAL, 2020, 57, (11), pp. 1767-1779
Issue Date:: 2020-11-01

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Field	Value	Language
dc.contributor.author	Indraratna, B https://orcid.org/0000-0002-9057-1514
dc.contributor.author	Singh, M
dc.contributor.author	Thanh, TN
dc.contributor.author	Leroueil, S
dc.contributor.author	Abeywickrama, A
dc.contributor.author	Kelly, R
dc.contributor.author	Neville, T
dc.date.accessioned	2021-01-14T03:10:21Z
dc.date.available	2021-01-14T03:10:21Z
dc.date.issued	2020-11-01
dc.identifier.citation	CANADIAN GEOTECHNICAL JOURNAL, 2020, 57, (11), pp. 1767-1779
dc.identifier.issn	0008-3674
dc.identifier.issn	1208-6010
dc.identifier.uri	http://hdl.handle.net/10453/145417
dc.description.abstract	<jats:p> A long-term issue that has hampered the efficient operation of heavy-haul tracks is the migration of fluidized fines from the shallow soft subgrade to the overlying ballast, i.e., mud pumping. This paper presents a series of undrained cyclic triaxial tests where realistic cyclic loading conditions were simulated at low confining pressure that is typical of shallow subgrade beneath a ballast track. Subgrade soil specimens with a low-plasticity index collected from a field site with recent history of mud pumping were tested at frequencies from 1.0 to 5.0 Hz and a cyclic stress ratio (CSR) from 0.1 to 1.0. The experimental results indicate that under adverse loading conditions of critical cyclic stress ratio (CSR<jats:sub>c</jats:sub>) and frequency, there is upward migration of moisture and the finest particles towards the specimen top and this causes the uppermost part of the soil specimen to soften and fluidize. Conversely, a smaller value of CSR tends to maintain stability of the specimen despite the increasing number of loading cycles. It is noteworthy that for any given combination of CSR and frequency, the relative compaction has a significant influence on the cyclic behaviour of the soil and its potential for fluidization. </jats:p>
dc.language	English
dc.publisher	CANADIAN SCIENCE PUBLISHING
dc.relation	http://purl.org/au-research/grants/arc/LP160101254
dc.relation.ispartof	CANADIAN GEOTECHNICAL JOURNAL
dc.relation.isbasedon	10.1139/cgj-2019-0350
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.subject	0905 Civil Engineering, 0907 Environmental Engineering
dc.subject.classification	Geological & Geomatics Engineering
dc.title	Laboratory study on subgrade fluidization under undrained cyclic triaxial loading
dc.type	Journal Article
utslib.citation.volume	57
utslib.for	0905 Civil Engineering
utslib.for	0907 Environmental Engineering
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	2021-01-14T03:10:03Z
pubs.issue	11
pubs.publication-status	Published
pubs.volume	57
utslib.citation.issue	11

Abstract:

A long-term issue that has hampered the efficient operation of heavy-haul tracks is the migration of fluidized fines from the shallow soft subgrade to the overlying ballast, i.e., mud pumping. This paper presents a series of undrained cyclic triaxial tests where realistic cyclic loading conditions were simulated at low confining pressure that is typical of shallow subgrade beneath a ballast track. Subgrade soil specimens with a low-plasticity index collected from a field site with recent history of mud pumping were tested at frequencies from 1.0 to 5.0 Hz and a cyclic stress ratio (CSR) from 0.1 to 1.0. The experimental results indicate that under adverse loading conditions of critical cyclic stress ratio (CSRc) and frequency, there is upward migration of moisture and the finest particles towards the specimen top and this causes the uppermost part of the soil specimen to soften and fluidize. Conversely, a smaller value of CSR tends to maintain stability of the specimen despite the increasing number of loading cycles. It is noteworthy that for any given combination of CSR and frequency, the relative compaction has a significant influence on the cyclic behaviour of the soil and its potential for fluidization.

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http://hdl.handle.net/10453/145417