Development of instrumented oedometer incorporated with bender element and electrical conductivity

Soft soils are normally associated with high moisture content and fine-grained particles possessing poor geotechnical properties such as low shear strength and high compressibility. Solidification, using hydraulic binders could be adopted to improve these poor properties. The compressibility of soil...

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Main Author:	Mofreh Gubran, Mohammed Mansoor
Format:	Thesis
Language:	English English English
Published:	2018
Subjects:	TA703-712 Engineering geology Rock mechanics Soil mechanics.
Online Access:	http://eprints.uthm.edu.my/226/1/24p%20MOHAMMED%20MANSOOR%20MOFREH%20GUBRAN.pdf http://eprints.uthm.edu.my/226/2/MOHAMMED%20MANSOOR%20MOFREH%20GUBRAN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/226/3/MOHAMMED%20MANSOOR%20MOFREH%20GUBRAN%20WATERMARK.pdf
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spelling	my-uthm-ep.2262021-07-13T01:26:47Z Development of instrumented oedometer incorporated with bender element and electrical conductivity 2018-04 Mofreh Gubran, Mohammed Mansoor TA703-712 Engineering geology. Rock mechanics. Soil mechanics. Soft soils are normally associated with high moisture content and fine-grained particles possessing poor geotechnical properties such as low shear strength and high compressibility. Solidification, using hydraulic binders could be adopted to improve these poor properties. The compressibility of soil is quantified by the settlement reduction due to the application of vertical load. Usually, the compressibility test is conducted on undisturbed saturated soils using standardised oedometer. In this study, an instrumented oedometer was developed by incorporating bender element transducers and electrical conductivity probe to investigate and correlate the compressibility, shear wave velocity (Vs) and electrical conductivity (EC) characteristics of solidified dredged marine clay and refined kaolin. Ordinary Portland cement was used at 5 %, 10 % and 15 % by dry weight of soil as a solidification agent. All specimens were mixed at twice the liquid limit. Prior to testing, all solidified specimens were cured for 7 days. It was found that Vs increased continuously with further curing time whereas EC increased during the first day and decreased with further curing. The compressibility was reduced and yield stress was developed as the cement content increased. Vs and EC showed good correlation with applied stress during the loading stage as the strain increased. For all loading stages, Vs increased when the strain increased while EC decreased as the strain increased. Similarly, Vs, EC and e showed good relationship as the vertical stress increased. These results showed good relationship and strong correlations between the compressibility parameters and Vs and EC measurements which give some insights on the solidification mechanism and improvement of stiffness. These results also confirmed that the instrumented oedometer incorporated with bender element and electrical conductivity probes can be applied on soft soils to monitor the compressibility behaviour at micro level. Moreover, the obtained relationships could be adopted in numerical modelling as well design analysis of similar soils in situ. 2018-04 Thesis http://eprints.uthm.edu.my/226/ http://eprints.uthm.edu.my/226/1/24p%20MOHAMMED%20MANSOOR%20MOFREH%20GUBRAN.pdf text en public http://eprints.uthm.edu.my/226/2/MOHAMMED%20MANSOOR%20MOFREH%20GUBRAN%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/226/3/MOHAMMED%20MANSOOR%20MOFREH%20GUBRAN%20WATERMARK.pdf text en validuser phd doctoral Universiti Tun Hussein Onn Malaysia Fakulti Teknologi Kejuruteraan
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	TA703-712 Engineering geology Rock mechanics Soil mechanics.
spellingShingle	TA703-712 Engineering geology Rock mechanics Soil mechanics. Mofreh Gubran, Mohammed Mansoor Development of instrumented oedometer incorporated with bender element and electrical conductivity
description	Soft soils are normally associated with high moisture content and fine-grained particles possessing poor geotechnical properties such as low shear strength and high compressibility. Solidification, using hydraulic binders could be adopted to improve these poor properties. The compressibility of soil is quantified by the settlement reduction due to the application of vertical load. Usually, the compressibility test is conducted on undisturbed saturated soils using standardised oedometer. In this study, an instrumented oedometer was developed by incorporating bender element transducers and electrical conductivity probe to investigate and correlate the compressibility, shear wave velocity (Vs) and electrical conductivity (EC) characteristics of solidified dredged marine clay and refined kaolin. Ordinary Portland cement was used at 5 %, 10 % and 15 % by dry weight of soil as a solidification agent. All specimens were mixed at twice the liquid limit. Prior to testing, all solidified specimens were cured for 7 days. It was found that Vs increased continuously with further curing time whereas EC increased during the first day and decreased with further curing. The compressibility was reduced and yield stress was developed as the cement content increased. Vs and EC showed good correlation with applied stress during the loading stage as the strain increased. For all loading stages, Vs increased when the strain increased while EC decreased as the strain increased. Similarly, Vs, EC and e showed good relationship as the vertical stress increased. These results showed good relationship and strong correlations between the compressibility parameters and Vs and EC measurements which give some insights on the solidification mechanism and improvement of stiffness. These results also confirmed that the instrumented oedometer incorporated with bender element and electrical conductivity probes can be applied on soft soils to monitor the compressibility behaviour at micro level. Moreover, the obtained relationships could be adopted in numerical modelling as well design analysis of similar soils in situ.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Mofreh Gubran, Mohammed Mansoor
author_facet	Mofreh Gubran, Mohammed Mansoor
author_sort	Mofreh Gubran, Mohammed Mansoor
title	Development of instrumented oedometer incorporated with bender element and electrical conductivity
title_short	Development of instrumented oedometer incorporated with bender element and electrical conductivity
title_full	Development of instrumented oedometer incorporated with bender element and electrical conductivity
title_fullStr	Development of instrumented oedometer incorporated with bender element and electrical conductivity
title_full_unstemmed	Development of instrumented oedometer incorporated with bender element and electrical conductivity
title_sort	development of instrumented oedometer incorporated with bender element and electrical conductivity
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Teknologi Kejuruteraan
publishDate	2018
url	http://eprints.uthm.edu.my/226/1/24p%20MOHAMMED%20MANSOOR%20MOFREH%20GUBRAN.pdf http://eprints.uthm.edu.my/226/2/MOHAMMED%20MANSOOR%20MOFREH%20GUBRAN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/226/3/MOHAMMED%20MANSOOR%20MOFREH%20GUBRAN%20WATERMARK.pdf
_version_	1747830558762729472

Development of instrumented oedometer incorporated with bender element and electrical conductivity

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