Parameterization of soil freezing characteristic curve for unsaturated soils

Teng, J; Kou, J; Yan, X; Zhang, S; Sheng, D

Parameterization of soil freezing characteristic curve for unsaturated soils

Teng, J Kou, J Yan, X Zhang, S Sheng, D

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Publisher:: ELSEVIER
Publication Type:: Journal Article
Citation:: Cold Regions Science and Technology, 2020, 170
Issue Date:: 2020-02-01

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Field	Value	Language
dc.contributor.author	Teng, J
dc.contributor.author	Kou, J
dc.contributor.author	Yan, X
dc.contributor.author	Zhang, S
dc.contributor.author	Sheng, D https://orcid.org/0000-0002-1665-6931
dc.date.accessioned	2021-03-25T20:12:41Z
dc.date.available	2021-03-25T20:12:41Z
dc.date.issued	2020-02-01
dc.identifier.citation	Cold Regions Science and Technology, 2020, 170
dc.identifier.issn	0165-232X
dc.identifier.issn	1872-7441
dc.identifier.uri	http://hdl.handle.net/10453/147532
dc.description.abstract	© 2019 The soil freezing characteristic curve (SFCC) describes the relationship between the temperature and unfrozen water content in a soil. The SFCC is indispensable in modelling the hydro-mechanical behaviour of frozen soils, but is less understood for the unsaturated soils. A series of SFCC tests of unsaturated silica sand, silt and red clay are preformed based on a newly developed nuclear magnetic resonance (NMR) apparatus, which can precisely control the sample temperature in the magnetic field. The experimental results show that the measured SFCC varies significantly for different initial water contents, and that a lower initial water content leads to a slower increase in unfrozen water content, proving that the SFCC is closely related to the initial unsaturated state. It is found that the thawing curve is better to represent the SFCC, in contrast the freezing curve is significantly affected by the supercooling phenomenon. A new parameterization of the SFCC is presented for unsaturated soils by combining the Clapeyron equation and the model for Soil Water Characteristic Curve (SWCC). A number of test results from the literature and this study are used to validate the new SFCC model. By inputting the parameters for the SWCC and initial state into the proposed model, the predicted SFCC can agree well with the measured results. The new model has a theoretical basis and simple form and is applicable to both saturated and unsaturated soils.
dc.language	English
dc.publisher	ELSEVIER
dc.relation.ispartof	Cold Regions Science and Technology
dc.relation.isbasedon	10.1016/j.coldregions.2019.102928
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0904 Chemical Engineering, 0905 Civil Engineering, 0911 Maritime Engineering
dc.subject.classification	Meteorology & Atmospheric Sciences
dc.title	Parameterization of soil freezing characteristic curve for unsaturated soils
dc.type	Journal Article
utslib.citation.volume	170
utslib.for	0905 Civil Engineering
utslib.for	0904 Chemical Engineering
utslib.for	0905 Civil Engineering
utslib.for	0911 Maritime 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	2021-03-25T20:12:40Z
pubs.publication-status	Published
pubs.volume	170

Abstract:

© 2019 The soil freezing characteristic curve (SFCC) describes the relationship between the temperature and unfrozen water content in a soil. The SFCC is indispensable in modelling the hydro-mechanical behaviour of frozen soils, but is less understood for the unsaturated soils. A series of SFCC tests of unsaturated silica sand, silt and red clay are preformed based on a newly developed nuclear magnetic resonance (NMR) apparatus, which can precisely control the sample temperature in the magnetic field. The experimental results show that the measured SFCC varies significantly for different initial water contents, and that a lower initial water content leads to a slower increase in unfrozen water content, proving that the SFCC is closely related to the initial unsaturated state. It is found that the thawing curve is better to represent the SFCC, in contrast the freezing curve is significantly affected by the supercooling phenomenon. A new parameterization of the SFCC is presented for unsaturated soils by combining the Clapeyron equation and the model for Soil Water Characteristic Curve (SWCC). A number of test results from the literature and this study are used to validate the new SFCC model. By inputting the parameters for the SWCC and initial state into the proposed model, the predicted SFCC can agree well with the measured results. The new model has a theoretical basis and simple form and is applicable to both saturated and unsaturated soils.

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http://hdl.handle.net/10453/147532