Stone column-stabilized soft-soil performance influenced by clogging and lateral deformation: Laboratory and numerical evaluation

Basack, S; Siahaan, F; Indraratna, B; Rujikiatkamjorn, C

Stone column-stabilized soft-soil performance influenced by clogging and lateral deformation: Laboratory and numerical evaluation

Basack, S Siahaan, F Indraratna, B

Rujikiatkamjorn, C

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Publisher:: ASCE-AMER SOC CIVIL ENGINEERS
Publication Type:: Journal Article
Citation:: International Journal of Geomechanics, 2018, 18, (6)
Issue Date:: 2018-06-01

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Field	Value	Language
dc.contributor.author	Basack, S
dc.contributor.author	Siahaan, F
dc.contributor.author	Indraratna, B https://orcid.org/0000-0002-9057-1514
dc.contributor.author	Rujikiatkamjorn, C https://orcid.org/0000-0001-8625-2839
dc.date.accessioned	2022-08-25T08:43:05Z
dc.date.available	2022-08-25T08:43:05Z
dc.date.issued	2018-06-01
dc.identifier.citation	International Journal of Geomechanics, 2018, 18, (6)
dc.identifier.issn	1532-3641
dc.identifier.issn	1943-5622
dc.identifier.uri	http://hdl.handle.net/10453/160852
dc.description.abstract	Stabilizing the soft clay by stone column reinforcement is one of the most accepted methods of ground improvement techniques. Because of their larger diameter and higher hydraulic conductivity, drainage with stone columns is much faster than prefabricated vertical drains (PVDs) or sand compaction piles (SCPs). Still, a significant hydraulic gradient at the soil-column interface induces migration of clay particles into the column pores, leading to clogging, which adversely affects the consolidation rate of soft soil. The load bearing capacity that stone columns acquire depends primarily on the lateral confinement offered by the surrounding soft soil. Because of limited confinement at shallow depths, the stone column deforms laterally leading to bulging. This paper presents an in-depth study on the load settlement and consolidation characteristics of soft clay stabilized by stone columns with particular reference to clogging and lateral deformation via laboratory model tests and numerical analysis. The laboratory investigation includes one-dimensional consolidation tests with instrumented columns in reconstituted soft clay, X-ray computed tomography (CT) scanning to study the load transfer, column deformation and clogging characteristics, and a numerical analysis based on a fast Lagrangian finite-difference technique with associated subroutines. Previous solutions developed by the authors have been substantially modified to accommodate a time dependency of clogging, load transfer, and lateral deformation of columns. The proposed solutions are validated by experimental results, which demonstrate that the load settlement and column deformation pattern as well as the consolidation characteristics are significantly affected by clogging and lateral deformation of stone column.
dc.language	English
dc.publisher	ASCE-AMER SOC CIVIL ENGINEERS
dc.relation.ispartof	International Journal of Geomechanics
dc.relation.isbasedon	10.1061/(ASCE)GM.1943-5622.0001148
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 0914 Resources Engineering and Extractive Metallurgy
dc.subject.classification	General Mathematics
dc.title	Stone column-stabilized soft-soil performance influenced by clogging and lateral deformation: Laboratory and numerical evaluation
dc.type	Journal Article
utslib.citation.volume	18
utslib.for	0905 Civil Engineering
utslib.for	0914 Resources Engineering and Extractive Metallurgy
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	closed_access	*
dc.date.updated	2022-08-25T08:43:02Z
pubs.issue	6
pubs.publication-status	Published
pubs.volume	18
utslib.citation.issue	6

Abstract:

Stabilizing the soft clay by stone column reinforcement is one of the most accepted methods of ground improvement techniques. Because of their larger diameter and higher hydraulic conductivity, drainage with stone columns is much faster than prefabricated vertical drains (PVDs) or sand compaction piles (SCPs). Still, a significant hydraulic gradient at the soil-column interface induces migration of clay particles into the column pores, leading to clogging, which adversely affects the consolidation rate of soft soil. The load bearing capacity that stone columns acquire depends primarily on the lateral confinement offered by the surrounding soft soil. Because of limited confinement at shallow depths, the stone column deforms laterally leading to bulging. This paper presents an in-depth study on the load settlement and consolidation characteristics of soft clay stabilized by stone columns with particular reference to clogging and lateral deformation via laboratory model tests and numerical analysis. The laboratory investigation includes one-dimensional consolidation tests with instrumented columns in reconstituted soft clay, X-ray computed tomography (CT) scanning to study the load transfer, column deformation and clogging characteristics, and a numerical analysis based on a fast Lagrangian finite-difference technique with associated subroutines. Previous solutions developed by the authors have been substantially modified to accommodate a time dependency of clogging, load transfer, and lateral deformation of columns. The proposed solutions are validated by experimental results, which demonstrate that the load settlement and column deformation pattern as well as the consolidation characteristics are significantly affected by clogging and lateral deformation of stone column.

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http://hdl.handle.net/10453/160852