Impacts of matric suction equalization on small strain shear modulus of soils during air drying

Ngoc, TP; Fatahi, B; Khabbaz, H; Sheng, D

Impacts of matric suction equalization on small strain shear modulus of soils during air drying

Ngoc, TP Fatahi, B

Khabbaz, H Sheng, D

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Publisher:: CANADIAN SCIENCE PUBLISHING
Publication Type:: Journal Article
Citation:: Canadian Geotechnical Journal, 2020, 57, (12), pp. 1982-1997
Issue Date:: 2020-01-01

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Field	Value	Language
dc.contributor.author	Ngoc, TP
dc.contributor.author	Fatahi, B https://orcid.org/0000-0002-7920-6946
dc.contributor.author	Khabbaz, H
dc.contributor.author	Sheng, D https://orcid.org/0000-0002-1665-6931
dc.date.accessioned	2021-02-10T19:28:40Z
dc.date.available	2021-02-10T19:28:40Z
dc.date.issued	2020-01-01
dc.identifier.citation	Canadian Geotechnical Journal, 2020, 57, (12), pp. 1982-1997
dc.identifier.issn	0008-3674
dc.identifier.issn	1208-6010
dc.identifier.uri	http://hdl.handle.net/10453/146021
dc.description.abstract	© 2020, Canadian Science Publishing. All rights reserved. In this study, a weight-control bender element system has been developed to investigate the impact of matric suction equalization on the measurement of small strain shear modulus (Gmax) during an air-drying process. The setup employed is capable of measuring the shear wave velocity and the corresponding Gmax of the soil sample in either an open system in which the soil sample evaporates freely or in a closed system that allows the process of matric suction equalization. The comparison between measurements of Gmax in the open and closed systems revealed underestimations of Gmax when matric suction equalization was ignored due to the nonuniform distribution of water content across the sample cross-sectional area. This study also investigated the time required for matric suction equalization tse to be established for samples with different sizes. The experimental results indicated two main mechanisms driving the matric suction equalization in a closed system during an air-drying process, namely the hydraulic flow of water and the flow of vapour. While the former played the key role when the micropores were still saturated at the high range of water content, effects of the latter increased and finally dominated when more air invaded the micropores at lower water contents.
dc.language	English
dc.publisher	CANADIAN SCIENCE PUBLISHING
dc.relation.ispartof	Canadian Geotechnical Journal
dc.relation.isbasedon	10.1139/cgj-2019-0742
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 0907 Environmental Engineering
dc.subject.classification	Geological & Geomatics Engineering
dc.title	Impacts of matric suction equalization on small strain shear modulus of soils during air drying
dc.type	Journal Article
utslib.citation.volume	57
utslib.for	0905 Civil Engineering
utslib.for	0907 Environmental Engineering
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
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
utslib.copyright.status	closed_access	*
dc.date.updated	2021-02-10T19:28:27Z
pubs.issue	12
pubs.publication-status	Published
pubs.volume	57
utslib.citation.issue	12

Abstract:

© 2020, Canadian Science Publishing. All rights reserved. In this study, a weight-control bender element system has been developed to investigate the impact of matric suction equalization on the measurement of small strain shear modulus (Gmax) during an air-drying process. The setup employed is capable of measuring the shear wave velocity and the corresponding Gmax of the soil sample in either an open system in which the soil sample evaporates freely or in a closed system that allows the process of matric suction equalization. The comparison between measurements of Gmax in the open and closed systems revealed underestimations of Gmax when matric suction equalization was ignored due to the nonuniform distribution of water content across the sample cross-sectional area. This study also investigated the time required for matric suction equalization tse to be established for samples with different sizes. The experimental results indicated two main mechanisms driving the matric suction equalization in a closed system during an air-drying process, namely the hydraulic flow of water and the flow of vapour. While the former played the key role when the micropores were still saturated at the high range of water content, effects of the latter increased and finally dominated when more air invaded the micropores at lower water contents.

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http://hdl.handle.net/10453/146021