Radial Consolidation of Soft Soils in Vietnam's Red River Delta: Effect of Drain Diameter on Undisturbed and Remolded Samples

Nguyen, TD; Nguyen, CK; Nguyen, TT

Radial Consolidation of Soft Soils in Vietnam's Red River Delta: Effect of Drain Diameter on Undisturbed and Remolded Samples

Nguyen, TD Nguyen, CK Nguyen, TT

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Publisher:: SPRINGER
Publication Type:: Journal Article
Citation:: GEOTECHNICAL AND GEOLOGICAL ENGINEERING, 2025, 43, (6)
Issue Date:: 2025-08

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Field	Value	Language
dc.contributor.author	Nguyen, TD
dc.contributor.author	Nguyen, CK
dc.contributor.author	Nguyen, TT
dc.date.accessioned	2025-07-15T06:51:38Z
dc.date.available	2025-07-15T06:51:38Z
dc.date.issued	2025-08
dc.identifier.citation	GEOTECHNICAL AND GEOLOGICAL ENGINEERING, 2025, 43, (6)
dc.identifier.issn	0960-3182
dc.identifier.issn	1573-1529
dc.identifier.uri	http://hdl.handle.net/10453/188406
dc.description.abstract	Given the increasing demand for soft soil improvement in Red River Delta of Vietnam in the past decade, this study is dedicated to characterizing radial consolidation behaviour of clayey soils in the delta, while varying drain size in the radial consolidation test. Undisturbed soil samples were collected from 3 different sites and subjected to a series of radial and vertical consolidation tests. The central drain diameter in radial consolidation test is varied from 12 to 28 mm, corresponding to the drain spacing ratio n changing from 5.17 to 2.21, to investigate the influence of drainage length on the interpreted outcomes. The alteration of consolidation parameters induced by soil remolding is also studied by comparing the test results of undisturbed and remolded soils. The test results indicate that smaller drain diameter (i.e., larger drainage length) results in larger coefficient of radial consolidation (cr), for example, cr increases by a factor of 2 when the drain size varies from 28 mm (n = 2.21) to 20 mm (n = 3.1). However, when n > 3.1, the influence of drainage length on the value of cr decreases apparently, despite the applied pressure rising from 25 to 800 kPa. New correlations describing the relationship between the value of cr and n are proposed. On the other hand, soil remolding can cause permeability and coefficient of consolidation to decrease by a factor of 2 to 10. The soil parameters determined from this study are used to implement finite element analysis, resulting in acceptable accuracy of settlement prediction, thus considerable values to practical design of soft soil improvement by PVDs in Red River Delta.
dc.language	English
dc.publisher	SPRINGER
dc.relation.ispartof	GEOTECHNICAL AND GEOLOGICAL ENGINEERING
dc.relation.isbasedon	10.1007/s10706-025-03178-z
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0905 Civil Engineering
dc.subject.classification	Geological & Geomatics Engineering
dc.subject.classification	4005 Civil engineering
dc.subject.classification	4019 Resources engineering and extractive metallurgy
dc.title	Radial Consolidation of Soft Soils in Vietnam's Red River Delta: Effect of Drain Diameter on Undisturbed and Remolded Samples
dc.type	Journal Article
utslib.citation.volume	43
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
pubs.organisational-group	University of Technology Sydney/UTS Groups
pubs.organisational-group	University of Technology Sydney/UTS Groups/Transport Research Centre (TRC)
utslib.copyright.status	open_access	*
dc.rights.license	This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0). To view a copy of this license, visit https://creativecommons.org/licenses/by/4.0/
dc.date.updated	2025-07-15T06:51:36Z
pubs.issue	6
pubs.publication-status	Accepted
pubs.volume	43
utslib.citation.issue	6

Abstract:

Given the increasing demand for soft soil improvement in Red River Delta of Vietnam in the past decade, this study is dedicated to characterizing radial consolidation behaviour of clayey soils in the delta, while varying drain size in the radial consolidation test. Undisturbed soil samples were collected from 3 different sites and subjected to a series of radial and vertical consolidation tests. The central drain diameter in radial consolidation test is varied from 12 to 28 mm, corresponding to the drain spacing ratio n changing from 5.17 to 2.21, to investigate the influence of drainage length on the interpreted outcomes. The alteration of consolidation parameters induced by soil remolding is also studied by comparing the test results of undisturbed and remolded soils. The test results indicate that smaller drain diameter (i.e., larger drainage length) results in larger coefficient of radial consolidation (cr), for example, cr increases by a factor of 2 when the drain size varies from 28 mm (n = 2.21) to 20 mm (n = 3.1). However, when n > 3.1, the influence of drainage length on the value of cr decreases apparently, despite the applied pressure rising from 25 to 800 kPa. New correlations describing the relationship between the value of cr and n are proposed. On the other hand, soil remolding can cause permeability and coefficient of consolidation to decrease by a factor of 2 to 10. The soil parameters determined from this study are used to implement finite element analysis, resulting in acceptable accuracy of settlement prediction, thus considerable values to practical design of soft soil improvement by PVDs in Red River Delta.

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http://hdl.handle.net/10453/188406