Mechanism of thawing

Document identifier: oai:DiVA.org:ltu-77774
Access full text here:10.1080/23311916.2020.1716438
Keyword: Engineering and Technology, Civil Engineering, Geotechnical Engineering, Teknik och teknologier, Samhällsbyggnadsteknik, Geoteknik, Freezing, Thawing, Image analysis, Frost actions, Laboratory freezing-thawing tests, Thaw settlement, Soil Mechanics
Publication year: 2020
Relevant Sustainable Development Goals (SDGs):
SDG 15 Life on land
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

Freezing–thawing phenomena have been studied at laboratory scale for decades with various techniques and test setups. In this study, a freezing–thawing laboratory apparatus was supplemented with a camera in order to get a better understanding of ice formation during the freezing period and ice melting during the thawing period. The results from three thawing tests with identical samples but different boundary conditions are presented here. Water intends to migrate upward even when the entire frozen part has been thawed. That would cause excess pore water pressure and softening of the soil after the thawing period as well. Upward water migration after the thawing period is due to changes in thawed soil properties such as permeability and fine particle redistribution. The rate at which thawing takes place is a very important factor for thawing conditions. Moreover, freezing condition, i.e. access to water, has a high impact on thawing soil. If the volume of ice lenses is sufficient, frozen soil would fluidize during thawing.

Authors

Amin Zeinali

Luleå tekniska universitet; Geoteknologi
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Tommy Edeskär

Luleå tekniska universitet; Geoteknologi
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Jan Laue

Luleå tekniska universitet; Geoteknologi
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