Triaxial stress path tests on artificially prepared analogue alpine permafrost soil
Some degrading rock glaciers have been exhibiting deepening depressions, accelerating strain rates, and, in some rare cases, sudden release of mass movements. Warming permafrost already mobilizes lower strength as temperatures rise; however, unusual stress paths with lateral stresses greater than ve...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/371438 2023-08-15T12:42:47+02:00 Triaxial stress path tests on artificially prepared analogue alpine permafrost soil Yamamoto, Yuko Springman, Sarah M. 2019-10 application/application/pdf https://hdl.handle.net/20.500.11850/371438 https://doi.org/10.3929/ethz-b-000371438 en fr eng fre Canadian Science Publishing info:eu-repo/semantics/altIdentifier/doi/10.1139/cgj-2017-0737 info:eu-repo/semantics/altIdentifier/wos/000488768000007 http://hdl.handle.net/20.500.11850/371438 doi:10.3929/ethz-b-000371438 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International Canadian Geotechnical Journal, 56 (10) permafrost frozen soil shear strength triaxial stress path testing acoustic emissions info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2019 ftethz https://doi.org/20.500.11850/37143810.3929/ethz-b-00037143810.1139/cgj-2017-0737 2023-07-23T23:46:31Z Some degrading rock glaciers have been exhibiting deepening depressions, accelerating strain rates, and, in some rare cases, sudden release of mass movements. Warming permafrost already mobilizes lower strength as temperatures rise; however, unusual stress paths with lateral stresses greater than vertical stresses, instead of vice versa, could exacerbate this condition with lower strength at failure, and hence higher vulnerability. This paper investigates the mechanical behaviour of artificially frozen soil specimens at temperatures between –3.0 and –0.3 °C under various stress paths: axial (A) and lateral (L), compression (C), and extension (E), for total stress paths AC, AE, LE, LC. Acoustic emissions were detected during shearing to expose how the deformation mechanisms develop from a microstructural point of view. Deviatoric stress mobilized in the stress path tests was linearly dependent on the temperature (within the ranges tested): a temperature increase resulted in a decrease in residual deviatoric stress. Comparison between the residual deviatoric stresses obtained from the different stress path tests indicates that (i) values mobilized with radial stress greater than axial stress were lower than vice versa, (ii) more strength was mobilized when changing lateral stress paths than axial, with (iii) the lowest strength mobilized in AE beneath a depression. ISSN:0008-3674 ISSN:1208-6010 Article in Journal/Newspaper permafrost ETH Zürich Research Collection |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English French |
topic |
permafrost frozen soil shear strength triaxial stress path testing acoustic emissions |
spellingShingle |
permafrost frozen soil shear strength triaxial stress path testing acoustic emissions Yamamoto, Yuko Springman, Sarah M. Triaxial stress path tests on artificially prepared analogue alpine permafrost soil |
topic_facet |
permafrost frozen soil shear strength triaxial stress path testing acoustic emissions |
description |
Some degrading rock glaciers have been exhibiting deepening depressions, accelerating strain rates, and, in some rare cases, sudden release of mass movements. Warming permafrost already mobilizes lower strength as temperatures rise; however, unusual stress paths with lateral stresses greater than vertical stresses, instead of vice versa, could exacerbate this condition with lower strength at failure, and hence higher vulnerability. This paper investigates the mechanical behaviour of artificially frozen soil specimens at temperatures between –3.0 and –0.3 °C under various stress paths: axial (A) and lateral (L), compression (C), and extension (E), for total stress paths AC, AE, LE, LC. Acoustic emissions were detected during shearing to expose how the deformation mechanisms develop from a microstructural point of view. Deviatoric stress mobilized in the stress path tests was linearly dependent on the temperature (within the ranges tested): a temperature increase resulted in a decrease in residual deviatoric stress. Comparison between the residual deviatoric stresses obtained from the different stress path tests indicates that (i) values mobilized with radial stress greater than axial stress were lower than vice versa, (ii) more strength was mobilized when changing lateral stress paths than axial, with (iii) the lowest strength mobilized in AE beneath a depression. ISSN:0008-3674 ISSN:1208-6010 |
format |
Article in Journal/Newspaper |
author |
Yamamoto, Yuko Springman, Sarah M. |
author_facet |
Yamamoto, Yuko Springman, Sarah M. |
author_sort |
Yamamoto, Yuko |
title |
Triaxial stress path tests on artificially prepared analogue alpine permafrost soil |
title_short |
Triaxial stress path tests on artificially prepared analogue alpine permafrost soil |
title_full |
Triaxial stress path tests on artificially prepared analogue alpine permafrost soil |
title_fullStr |
Triaxial stress path tests on artificially prepared analogue alpine permafrost soil |
title_full_unstemmed |
Triaxial stress path tests on artificially prepared analogue alpine permafrost soil |
title_sort |
triaxial stress path tests on artificially prepared analogue alpine permafrost soil |
publisher |
Canadian Science Publishing |
publishDate |
2019 |
url |
https://hdl.handle.net/20.500.11850/371438 https://doi.org/10.3929/ethz-b-000371438 |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Canadian Geotechnical Journal, 56 (10) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1139/cgj-2017-0737 info:eu-repo/semantics/altIdentifier/wos/000488768000007 http://hdl.handle.net/20.500.11850/371438 doi:10.3929/ethz-b-000371438 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_doi |
https://doi.org/20.500.11850/37143810.3929/ethz-b-00037143810.1139/cgj-2017-0737 |
_version_ |
1774297378992422912 |