Analytical model for consolidation and bearing capacity of soft soil stabilized by combined PVD-deep cement mixing columns

Nguyen, BP; Nguyen, TT; Nguyen, T; Guo, W

Analytical model for consolidation and bearing capacity of soft soil stabilized by combined PVD-deep cement mixing columns

Nguyen, BP Nguyen, TT Nguyen, T

Guo, W

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Publisher:: SPRINGER HEIDELBERG
Publication Type:: Journal Article
Citation:: Bulletin of Engineering Geology and the Environment, 2023, 82, (7)
Issue Date:: 2023-07-01

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Field	Value	Language
dc.contributor.author	Nguyen, BP
dc.contributor.author	Nguyen, TT
dc.contributor.author	Nguyen, T https://orcid.org/0000-0001-6078-2559
dc.contributor.author	Guo, W
dc.date.accessioned	2024-03-18T01:21:28Z
dc.date.available	2024-03-18T01:21:28Z
dc.date.issued	2023-07-01
dc.identifier.citation	Bulletin of Engineering Geology and the Environment, 2023, 82, (7)
dc.identifier.issn	1435-9529
dc.identifier.issn	1435-9537
dc.identifier.uri	http://hdl.handle.net/10453/176842
dc.description.abstract	Soil improvement can be enhanced significantly when combining the two well-known methods, i.e., prefabricated vertical drains (PVDs) and deep cement mixing (DCM) columns. While this approach has been proved to be effective through recent site studies, there is a lack of rigorous theoretical methods to model the coupled effects of PVDs and DCM columns on soil behavior. This paper hence aims to propose a novel analytical solution for consolidation of soft ground stabilized by the combined PVDs-DCM columns. The solution is developed with radial drainage, in which the effects of smear zone, well resistance, and nonlinear behavior of permeability and compressibility during the consolidation process are simultaneously considered. The proposed solution is verified by comparing itself with field data and previous theoretical solutions. The results indicate promising outcomes from the proposed model considering its good agreements with field data and other solutions. Subsequently, key parameters affecting the performance of composite PVDs-DCM foundation are investigated using the proposed solution. The results show that the effects of the compression modulus and cross-section area of DCM columns on consolidation rate are prevalent over their hydraulic conductivity. The discharge capacity of PVDs significantly affects the short-term bearing capacity of the DCM columns. The study offers significant values to industry applications via the newly proposed model and parametric assessment.
dc.language	English
dc.publisher	SPRINGER HEIDELBERG
dc.relation.ispartof	Bulletin of Engineering Geology and the Environment
dc.relation.isbasedon	10.1007/s10064-023-03287-0
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0403 Geology, 0905 Civil Engineering
dc.subject.classification	Geological & Geomatics Engineering
dc.subject.classification	3705 Geology
dc.subject.classification	4005 Civil engineering
dc.title	Analytical model for consolidation and bearing capacity of soft soil stabilized by combined PVD-deep cement mixing columns
dc.type	Journal Article
utslib.citation.volume	82
utslib.for	0403 Geology
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	closed_access	*
dc.date.updated	2024-03-18T01:21:21Z
pubs.issue	7
pubs.publication-status	Published
pubs.volume	82
utslib.citation.issue	7

Abstract:

Soil improvement can be enhanced significantly when combining the two well-known methods, i.e., prefabricated vertical drains (PVDs) and deep cement mixing (DCM) columns. While this approach has been proved to be effective through recent site studies, there is a lack of rigorous theoretical methods to model the coupled effects of PVDs and DCM columns on soil behavior. This paper hence aims to propose a novel analytical solution for consolidation of soft ground stabilized by the combined PVDs-DCM columns. The solution is developed with radial drainage, in which the effects of smear zone, well resistance, and nonlinear behavior of permeability and compressibility during the consolidation process are simultaneously considered. The proposed solution is verified by comparing itself with field data and previous theoretical solutions. The results indicate promising outcomes from the proposed model considering its good agreements with field data and other solutions. Subsequently, key parameters affecting the performance of composite PVDs-DCM foundation are investigated using the proposed solution. The results show that the effects of the compression modulus and cross-section area of DCM columns on consolidation rate are prevalent over their hydraulic conductivity. The discharge capacity of PVDs significantly affects the short-term bearing capacity of the DCM columns. The study offers significant values to industry applications via the newly proposed model and parametric assessment.

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http://hdl.handle.net/10453/176842