Centrifuge modelling of axially loaded steel piles in cold and thawing frozen sand
Foundations in northern climates are founded under ground conditions that are certain to change due to climate warming. Piled foundations situated in permafrost are designed to resist loads by mobilising the shaft friction from adfreeze strength that is attributed to the ice–soil bonds in contact wi...
Published in: | International Journal of Physical Modelling in Geotechnics |
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Language: | English |
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Online Access: | http://dx.doi.org/10.1680/jphmg.22.00062 https://www.icevirtuallibrary.com/doi/pdf/10.1680/jphmg.22.00062 |
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cremerald:10.1680/jphmg.22.00062 2024-06-16T07:40:40+00:00 Centrifuge modelling of axially loaded steel piles in cold and thawing frozen sand Clarkson, Chris Eichhorn, Geoff Siemens, Greg 2024 http://dx.doi.org/10.1680/jphmg.22.00062 https://www.icevirtuallibrary.com/doi/pdf/10.1680/jphmg.22.00062 en eng Emerald International Journal of Physical Modelling in Geotechnics volume 24, issue 3, page 124-135 ISSN 1346-213X 2042-6550 journal-article 2024 cremerald https://doi.org/10.1680/jphmg.22.00062 2024-05-22T12:57:36Z Foundations in northern climates are founded under ground conditions that are certain to change due to climate warming. Piled foundations situated in permafrost are designed to resist loads by mobilising the shaft friction from adfreeze strength that is attributed to the ice–soil bonds in contact with the pile. Design considers ground warming causing thawing over time and normally specifies a thermal condition whereby mitigation measures, such as thermosyphons, need to be implemented. While pile design and analysis for completely frozen and thawed profiles are defined in terms of pile capacity, the intermediate condition, during transition from frozen to thawed, is not well examined. In this study, centrifuge modelling is utilised to quantify the reduction in pile capacity and foundation stiffness under an axial monotonic loading as initially frozen sand profiles warm and thaw depth increases. The results show agreement between the physical models and analytical methods for piles in fully frozen and thawed ground. A marked decrease in pile capacity occurs as ground temperatures approach freezing and thaw depth increases. The results are the first comprehensive physical model testing programme aimed at quantifying pile performance in frozen and warming ground under field-realistic stress conditions. Article in Journal/Newspaper Ice permafrost Emerald International Journal of Physical Modelling in Geotechnics 24 3 124 135 |
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Open Polar |
collection |
Emerald |
op_collection_id |
cremerald |
language |
English |
description |
Foundations in northern climates are founded under ground conditions that are certain to change due to climate warming. Piled foundations situated in permafrost are designed to resist loads by mobilising the shaft friction from adfreeze strength that is attributed to the ice–soil bonds in contact with the pile. Design considers ground warming causing thawing over time and normally specifies a thermal condition whereby mitigation measures, such as thermosyphons, need to be implemented. While pile design and analysis for completely frozen and thawed profiles are defined in terms of pile capacity, the intermediate condition, during transition from frozen to thawed, is not well examined. In this study, centrifuge modelling is utilised to quantify the reduction in pile capacity and foundation stiffness under an axial monotonic loading as initially frozen sand profiles warm and thaw depth increases. The results show agreement between the physical models and analytical methods for piles in fully frozen and thawed ground. A marked decrease in pile capacity occurs as ground temperatures approach freezing and thaw depth increases. The results are the first comprehensive physical model testing programme aimed at quantifying pile performance in frozen and warming ground under field-realistic stress conditions. |
format |
Article in Journal/Newspaper |
author |
Clarkson, Chris Eichhorn, Geoff Siemens, Greg |
spellingShingle |
Clarkson, Chris Eichhorn, Geoff Siemens, Greg Centrifuge modelling of axially loaded steel piles in cold and thawing frozen sand |
author_facet |
Clarkson, Chris Eichhorn, Geoff Siemens, Greg |
author_sort |
Clarkson, Chris |
title |
Centrifuge modelling of axially loaded steel piles in cold and thawing frozen sand |
title_short |
Centrifuge modelling of axially loaded steel piles in cold and thawing frozen sand |
title_full |
Centrifuge modelling of axially loaded steel piles in cold and thawing frozen sand |
title_fullStr |
Centrifuge modelling of axially loaded steel piles in cold and thawing frozen sand |
title_full_unstemmed |
Centrifuge modelling of axially loaded steel piles in cold and thawing frozen sand |
title_sort |
centrifuge modelling of axially loaded steel piles in cold and thawing frozen sand |
publisher |
Emerald |
publishDate |
2024 |
url |
http://dx.doi.org/10.1680/jphmg.22.00062 https://www.icevirtuallibrary.com/doi/pdf/10.1680/jphmg.22.00062 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
International Journal of Physical Modelling in Geotechnics volume 24, issue 3, page 124-135 ISSN 1346-213X 2042-6550 |
op_doi |
https://doi.org/10.1680/jphmg.22.00062 |
container_title |
International Journal of Physical Modelling in Geotechnics |
container_volume |
24 |
container_issue |
3 |
container_start_page |
124 |
op_container_end_page |
135 |
_version_ |
1802007630867070976 |