A coupled model for liquid water-vapor-heat migration in freezing soils

He, Z; Zhang, S; Teng, J; Yao, Y; Sheng, D

A coupled model for liquid water-vapor-heat migration in freezing soils

He, Z Zhang, S Teng, J Yao, Y Sheng, D

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Publisher:: ELSEVIER SCIENCE BV
Publication Type:: Journal Article
Citation:: Cold Regions Science and Technology, 2018, 148, pp. 22-28
Issue Date:: 2018-04-01

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Field	Value	Language
dc.contributor.author	He, Z
dc.contributor.author	Zhang, S
dc.contributor.author	Teng, J
dc.contributor.author	Yao, Y
dc.contributor.author	Sheng, D https://orcid.org/0000-0002-1665-6931
dc.date.accessioned	2022-08-30T07:30:48Z
dc.date.available	2022-08-30T07:30:48Z
dc.date.issued	2018-04-01
dc.identifier.citation	Cold Regions Science and Technology, 2018, 148, pp. 22-28
dc.identifier.issn	0165-232X
dc.identifier.issn	1872-7441
dc.identifier.uri	http://hdl.handle.net/10453/161119
dc.description.abstract	Based on the seepage theory in unsaturated soil mechanics, a coupled model for liquid water-vapor-heat migration is established in this paper, which considers the phase changes of vapor–liquid and water-ice. The results of numerical analysis on layered unsaturated soils show that vapor migration can lead to a significant increase in the total volumetric water content. The depth of the maximum value of the total volumetric water content coincides with the depth of the freezing front (273.15K temperature line). Ground water table has a small effect on the total volumetric water content in silt. However, unfrozen water in the upper sand flows downward from the sand to the silt soil, due to gravitational and matric potentials. A lower temperature of the upper boundary can also lead to an apparent increase in the total volumetric water content. If the temperature of the upper boundary is above 273.15K, the effect of vapor migration on the soil column is small, producing only a 2% increase in the total volumetric water content. Considering actual engineering applications in the northwestern part of China, the water content of the embankments of high-speed railways and airports can also be increased significantly due to vapor migration. Therefore, both liquid water and vapor insulation countermeasures should be considered in practical engineering in frigid and arid regions.
dc.language	English
dc.publisher	ELSEVIER SCIENCE BV
dc.relation.ispartof	Cold Regions Science and Technology
dc.relation.isbasedon	10.1016/j.coldregions.2018.01.003
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	A coupled model for liquid water-vapor-heat migration in freezing soils
dc.type	Journal Article
utslib.citation.volume	148
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	2022-08-30T07:30:48Z
pubs.publication-status	Published
pubs.volume	148

Abstract:

Based on the seepage theory in unsaturated soil mechanics, a coupled model for liquid water-vapor-heat migration is established in this paper, which considers the phase changes of vapor–liquid and water-ice. The results of numerical analysis on layered unsaturated soils show that vapor migration can lead to a significant increase in the total volumetric water content. The depth of the maximum value of the total volumetric water content coincides with the depth of the freezing front (273.15K temperature line). Ground water table has a small effect on the total volumetric water content in silt. However, unfrozen water in the upper sand flows downward from the sand to the silt soil, due to gravitational and matric potentials. A lower temperature of the upper boundary can also lead to an apparent increase in the total volumetric water content. If the temperature of the upper boundary is above 273.15K, the effect of vapor migration on the soil column is small, producing only a 2% increase in the total volumetric water content. Considering actual engineering applications in the northwestern part of China, the water content of the embankments of high-speed railways and airports can also be increased significantly due to vapor migration. Therefore, both liquid water and vapor insulation countermeasures should be considered in practical engineering in frigid and arid regions.

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http://hdl.handle.net/10453/161119