Evaluation of the swelling characteristics of bentonite-sand mixtures

Sun, WJ; Wei, ZF; Sun, DA; Liu, SQ; Fatahi, B; Wang, XQ

Evaluation of the swelling characteristics of bentonite-sand mixtures

Sun, WJ Wei, ZF Sun, DA Liu, SQ Fatahi, B

Wang, XQ

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Publication Type:: Journal Article
Citation:: Engineering Geology, 2015, 199 pp. 1 - 11
Issue Date:: 2015-12-14

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Field	Value	Language
dc.contributor.author	Sun, WJ	en_US
dc.contributor.author	Wei, ZF	en_US
dc.contributor.author	Sun, DA	en_US
dc.contributor.author	Liu, SQ	en_US
dc.contributor.author	Fatahi, B https://orcid.org/0000-0002-7920-6946	en_US
dc.contributor.author	Wang, XQ	en_US
dc.date.issued	2015-12-14	en_US
dc.identifier.citation	Engineering Geology, 2015, 199 pp. 1 - 11	en_US
dc.identifier.issn	0013-7952	en_US
dc.identifier.uri	http://hdl.handle.net/10453/38940
dc.description.abstract	© 2015 Elsevier B.V. The swelling characteristic of bentonite-sand mixtures is an important index in evaluating the long term performance of the deep geological repository of nuclear waste. In this study the swelling characteristics of different types of bentonite-sand mixtures with various sand contents are compared. It is concluded that for pure bentonite and bentonite-sand mixtures with less sand than the critical sand content, the relationship between montmorillonite void ratio and vertical stress can be expressed as a unique line in a double logarithmic plot, and volumetric strain under a given vertical stress and swelling pressure at a constant volume after full saturation can be predicted based on this line; however, for mixtures with more sand than the critical sand content, the above relationship deviates from the line when the stress is larger than the starting deviation stress, which can be determined using the sand skeleton void ratio. Before the sand skeleton forms, the vertical stress is borne mainly by montmorillonite particles and the amount of swelling at full saturation is determined by the content of montmorillonite per unit volume, however, after the sand skeleton forms the vertical stress is borne by both the montmorillonite and the sand skeleton. The stress distribution coefficient is proposed to present a proportion of the vertical stress that is borne by both parts. A predictive method, verified by the swelling tests on bentonite-sand mixtures with various sand contents, is suggested to predict the amount of swelling due to saturation in the full range of sand content.	en_US
dc.relation.ispartof	Engineering Geology	en_US
dc.relation.isbasedon	10.1016/j.enggeo.2015.10.004	en_US
dc.subject.classification	Geological & Geomatics Engineering	en_US
dc.title	Evaluation of the swelling characteristics of bentonite-sand mixtures	en_US
dc.type	Journal Article
utslib.citation.volume	199	en_US
utslib.for	0905 Civil Engineering	en_US
utslib.for	0909 Geomatic Engineering	en_US
utslib.for	0999 Other Engineering	en_US
pubs.embargo.period	Not known	en_US
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/Strength - CBI - Centre for Built Infrastructure
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	199	en_US

Abstract:

© 2015 Elsevier B.V. The swelling characteristic of bentonite-sand mixtures is an important index in evaluating the long term performance of the deep geological repository of nuclear waste. In this study the swelling characteristics of different types of bentonite-sand mixtures with various sand contents are compared. It is concluded that for pure bentonite and bentonite-sand mixtures with less sand than the critical sand content, the relationship between montmorillonite void ratio and vertical stress can be expressed as a unique line in a double logarithmic plot, and volumetric strain under a given vertical stress and swelling pressure at a constant volume after full saturation can be predicted based on this line; however, for mixtures with more sand than the critical sand content, the above relationship deviates from the line when the stress is larger than the starting deviation stress, which can be determined using the sand skeleton void ratio. Before the sand skeleton forms, the vertical stress is borne mainly by montmorillonite particles and the amount of swelling at full saturation is determined by the content of montmorillonite per unit volume, however, after the sand skeleton forms the vertical stress is borne by both the montmorillonite and the sand skeleton. The stress distribution coefficient is proposed to present a proportion of the vertical stress that is borne by both parts. A predictive method, verified by the swelling tests on bentonite-sand mixtures with various sand contents, is suggested to predict the amount of swelling due to saturation in the full range of sand content.

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http://hdl.handle.net/10453/38940