One- and two-dimensional finite element modelling of thaw consolidation
Coupled thermo-hydro-mechanical finite element (FE) modelling of thaw consolidation is presented. One-dimensional FE analyses are performed for thaw consolidation of a soil column due to self-weight and with a combination of self-weight and surcharge, with the linear and nonlinear void ratio – effec...
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2022
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crcansciencepubl:10.1139/cgj-2021-0120 2024-05-19T07:47:12+00:00 One- and two-dimensional finite element modelling of thaw consolidation Dayarathne, Rajith Hawlader, Bipul Phillips, Ryan Robert, Dilan 2022 http://dx.doi.org/10.1139/cgj-2021-0120 https://cdnsciencepub.com/doi/full-xml/10.1139/cgj-2021-0120 https://cdnsciencepub.com/doi/pdf/10.1139/cgj-2021-0120 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Geotechnical Journal volume 59, issue 7, page 1130-1145 ISSN 0008-3674 1208-6010 journal-article 2022 crcansciencepubl https://doi.org/10.1139/cgj-2021-0120 2024-05-02T06:51:27Z Coupled thermo-hydro-mechanical finite element (FE) modelling of thaw consolidation is presented. One-dimensional FE analyses are performed for thaw consolidation of a soil column due to self-weight and with a combination of self-weight and surcharge, with the linear and nonlinear void ratio – effective stress – hydraulic conductivity relationships of thawed soil. The nonlinear behaviour of thawed soil is modelled using a modified Drucker–Prager cap model, while the hydraulic conductivity is varied with the void ratio. Finally, two-dimensional FE modelling of thaw consolidation around a warm pipeline buried in permafrost is performed. The rapid reduction of the void ratio with consolidation, especially at the low-stress level, results in a wide variation of hydraulic conductivity within the thawed zone. The significantly large hydraulic conductivity of soil elements along the curved thaw front, as compared to that of thaw consolidated soil, causes the flow of water along the thaw front, instead of a vertical flow, as assumed in previous 1D thaw consolidation modelling of buried pipelines. Article in Journal/Newspaper permafrost Canadian Science Publishing Canadian Geotechnical Journal |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Coupled thermo-hydro-mechanical finite element (FE) modelling of thaw consolidation is presented. One-dimensional FE analyses are performed for thaw consolidation of a soil column due to self-weight and with a combination of self-weight and surcharge, with the linear and nonlinear void ratio – effective stress – hydraulic conductivity relationships of thawed soil. The nonlinear behaviour of thawed soil is modelled using a modified Drucker–Prager cap model, while the hydraulic conductivity is varied with the void ratio. Finally, two-dimensional FE modelling of thaw consolidation around a warm pipeline buried in permafrost is performed. The rapid reduction of the void ratio with consolidation, especially at the low-stress level, results in a wide variation of hydraulic conductivity within the thawed zone. The significantly large hydraulic conductivity of soil elements along the curved thaw front, as compared to that of thaw consolidated soil, causes the flow of water along the thaw front, instead of a vertical flow, as assumed in previous 1D thaw consolidation modelling of buried pipelines. |
format |
Article in Journal/Newspaper |
author |
Dayarathne, Rajith Hawlader, Bipul Phillips, Ryan Robert, Dilan |
spellingShingle |
Dayarathne, Rajith Hawlader, Bipul Phillips, Ryan Robert, Dilan One- and two-dimensional finite element modelling of thaw consolidation |
author_facet |
Dayarathne, Rajith Hawlader, Bipul Phillips, Ryan Robert, Dilan |
author_sort |
Dayarathne, Rajith |
title |
One- and two-dimensional finite element modelling of thaw consolidation |
title_short |
One- and two-dimensional finite element modelling of thaw consolidation |
title_full |
One- and two-dimensional finite element modelling of thaw consolidation |
title_fullStr |
One- and two-dimensional finite element modelling of thaw consolidation |
title_full_unstemmed |
One- and two-dimensional finite element modelling of thaw consolidation |
title_sort |
one- and two-dimensional finite element modelling of thaw consolidation |
publisher |
Canadian Science Publishing |
publishDate |
2022 |
url |
http://dx.doi.org/10.1139/cgj-2021-0120 https://cdnsciencepub.com/doi/full-xml/10.1139/cgj-2021-0120 https://cdnsciencepub.com/doi/pdf/10.1139/cgj-2021-0120 |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Canadian Geotechnical Journal volume 59, issue 7, page 1130-1145 ISSN 0008-3674 1208-6010 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cgj-2021-0120 |
container_title |
Canadian Geotechnical Journal |
_version_ |
1799487519923896320 |