Effects of installation sequence of concrete rigid inclusions by ground-displacement piling method on previously installed columns

Nguyen, Huu Hung (Harry)

Effects of installation sequence of concrete rigid inclusions by ground-displacement piling method on previously installed columns

Nguyen, Huu Hung (Harry)

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Publication Type:: Thesis
Issue Date:: 2018

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Field	Value	Language
dc.contributor.author	Nguyen, Huu Hung (Harry)
dc.date.accessioned	2019-01-11T01:20:14Z
dc.date.available	2019-01-11T01:20:14Z
dc.date.issued	2018
dc.identifier.uri	http://hdl.handle.net/10453/129465
dc.description	University of Technology Sydney. Faculty of Engineering and Information Technology.	en_AU
dc.description.abstract	Ground improvement techniques using concrete injected column (CIC) or controlled modulus column (CMC) have been widely used since 1980s. However, impacts of ground displacement induced by the techniques have not been studied adequately. This project advances both experimental and numerical bases for assessing effects of installing CICs or CMCs on the surrounding soils and previously installed columns, with interests given to installation sequence and behaviour of concrete inclusion at early age. Three-dimensional numerical modelling was conducted to investigate how groups of columns installed in different sequences could affect previously installed columns. The assessment included coupled consolidation analyses in large strain mode, considering soil-column interaction. CMC installation was modelled numerically with the combined use of cylindrical and spherical cavity expansion theories. Where possible, the results were compared with analytical solutions and published field cases. The study revealed that the use of different installation sequences resulted in noticeable differences in the soil responses near existing CMCs as well as the difference in the bending moments generated in the previously installed columns. A soil-displacement piling rig and a fully instrumented soil tank were also designed and built in the laboratory to simulate column installations and to study the soil behaviour and the responses of previously built columns to nearby installations. A group of concrete columns were cast in-situ in soft soil using low strength concrete. The installation effects in terms of soil behaviours and structural responses of the columns were well captured by 3D laser scanning, soil miniature instrumentation, and a customised strain gauge system installed in CMCs. Test results revealed complex interactions between the soil and the columns, which are otherwise often difficult to observe in the field.	en_AU
dc.format	Thesis (PhD)
dc.language.iso	en_AU	en_AU
dc.relation	https://opus.lib.uts.edu.au/bitstream/10453/129465/2/02whole.pdf
dc.rights	The author owns the copyright in this thesis including all reproduction and reuse rights for the work. The work may not be altered without the permission of the copyright owner. Attribution is essential when quoting or paraphrasing from this thesis.
dc.rights	au.edu.uts.lib/ppc
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	rigid inclusion
dc.subject	piling rig
dc.subject	spherical cavity
dc.subject	cavity expansion
dc.subject	3D scanning
dc.subject	concrete column
dc.title	Effects of installation sequence of concrete rigid inclusions by ground-displacement piling method on previously installed columns	en_AU
dc.type	Thesis	en_AU
utslib.copyright.status	open_access

Abstract:

Ground improvement techniques using concrete injected column (CIC) or controlled modulus column (CMC) have been widely used since 1980s. However, impacts of ground displacement induced by the techniques have not been studied adequately. This project advances both experimental and numerical bases for assessing effects of installing CICs or CMCs on the surrounding soils and previously installed columns, with interests given to installation sequence and behaviour of concrete inclusion at early age. Three-dimensional numerical modelling was conducted to investigate how groups of columns installed in different sequences could affect previously installed columns. The assessment included coupled consolidation analyses in large strain mode, considering soil-column interaction. CMC installation was modelled numerically with the combined use of cylindrical and spherical cavity expansion theories. Where possible, the results were compared with analytical solutions and published field cases. The study revealed that the use of different installation sequences resulted in noticeable differences in the soil responses near existing CMCs as well as the difference in the bending moments generated in the previously installed columns. A soil-displacement piling rig and a fully instrumented soil tank were also designed and built in the laboratory to simulate column installations and to study the soil behaviour and the responses of previously built columns to nearby installations. A group of concrete columns were cast in-situ in soft soil using low strength concrete. The installation effects in terms of soil behaviours and structural responses of the columns were well captured by 3D laser scanning, soil miniature instrumentation, and a customised strain gauge system installed in CMCs. Test results revealed complex interactions between the soil and the columns, which are otherwise often difficult to observe in the field.

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http://hdl.handle.net/10453/129465