Undrained triaxial tests on water-saturated methane hydrate–bearing clayey-silty sediments of the South China Sea
Approximately 90% of gas hydrates are buried in fine-grained sediments, especially in the South China Sea. The potential instability of fine-grained sediments induced by hydrate dissociation requires investigation of the shear strength and pore pressure response of sediments during hydrate recovery....
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crcansciencepubl:10.1139/cgj-2019-0711 2024-06-23T07:54:36+00:00 Undrained triaxial tests on water-saturated methane hydrate–bearing clayey-silty sediments of the South China Sea Wang, Lei Sun, Xiang Shen, Shi Wu, Peng Liu, Tao Liu, Weiguo Zhao, Jiafei Li, Yanghui 2021 http://dx.doi.org/10.1139/cgj-2019-0711 https://cdnsciencepub.com/doi/full-xml/10.1139/cgj-2019-0711 https://cdnsciencepub.com/doi/pdf/10.1139/cgj-2019-0711 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Geotechnical Journal volume 58, issue 3, page 351-366 ISSN 0008-3674 1208-6010 journal-article 2021 crcansciencepubl https://doi.org/10.1139/cgj-2019-0711 2024-06-13T04:10:52Z Approximately 90% of gas hydrates are buried in fine-grained sediments, especially in the South China Sea. The potential instability of fine-grained sediments induced by hydrate dissociation requires investigation of the shear strength and pore pressure response of sediments during hydrate recovery. To date, most studies have focused on the undrained mechanical behavior of gas hydrate–bearing sand or gas hydrate–free clay — few studies have examined gas hydrate–bearing fine-grained sediments. Because of the low-permeability and water-saturated characteristics of the sediments in the South China Sea, a series of undrained triaxial shear tests were performed on water-saturated methane hydrate-bearing clayey–silty sediments in this area. The experimental results show that the failure strength of methane hydrate–bearing sediments (MHBSs) increases with the increase in hydrate saturation and initial effective mean stress. The excess pore-water pressure of MHBSs remains positive during shear. Cohesion in the Mohr–Coulomb model increases with the increase in hydrate saturation, while the internal friction angle in the Mohr–Coulomb model has little dependence on the hydrate saturation. Article in Journal/Newspaper Methane hydrate Canadian Science Publishing Canadian Geotechnical Journal 58 3 351 366 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
description |
Approximately 90% of gas hydrates are buried in fine-grained sediments, especially in the South China Sea. The potential instability of fine-grained sediments induced by hydrate dissociation requires investigation of the shear strength and pore pressure response of sediments during hydrate recovery. To date, most studies have focused on the undrained mechanical behavior of gas hydrate–bearing sand or gas hydrate–free clay — few studies have examined gas hydrate–bearing fine-grained sediments. Because of the low-permeability and water-saturated characteristics of the sediments in the South China Sea, a series of undrained triaxial shear tests were performed on water-saturated methane hydrate-bearing clayey–silty sediments in this area. The experimental results show that the failure strength of methane hydrate–bearing sediments (MHBSs) increases with the increase in hydrate saturation and initial effective mean stress. The excess pore-water pressure of MHBSs remains positive during shear. Cohesion in the Mohr–Coulomb model increases with the increase in hydrate saturation, while the internal friction angle in the Mohr–Coulomb model has little dependence on the hydrate saturation. |
format |
Article in Journal/Newspaper |
author |
Wang, Lei Sun, Xiang Shen, Shi Wu, Peng Liu, Tao Liu, Weiguo Zhao, Jiafei Li, Yanghui |
spellingShingle |
Wang, Lei Sun, Xiang Shen, Shi Wu, Peng Liu, Tao Liu, Weiguo Zhao, Jiafei Li, Yanghui Undrained triaxial tests on water-saturated methane hydrate–bearing clayey-silty sediments of the South China Sea |
author_facet |
Wang, Lei Sun, Xiang Shen, Shi Wu, Peng Liu, Tao Liu, Weiguo Zhao, Jiafei Li, Yanghui |
author_sort |
Wang, Lei |
title |
Undrained triaxial tests on water-saturated methane hydrate–bearing clayey-silty sediments of the South China Sea |
title_short |
Undrained triaxial tests on water-saturated methane hydrate–bearing clayey-silty sediments of the South China Sea |
title_full |
Undrained triaxial tests on water-saturated methane hydrate–bearing clayey-silty sediments of the South China Sea |
title_fullStr |
Undrained triaxial tests on water-saturated methane hydrate–bearing clayey-silty sediments of the South China Sea |
title_full_unstemmed |
Undrained triaxial tests on water-saturated methane hydrate–bearing clayey-silty sediments of the South China Sea |
title_sort |
undrained triaxial tests on water-saturated methane hydrate–bearing clayey-silty sediments of the south china sea |
publisher |
Canadian Science Publishing |
publishDate |
2021 |
url |
http://dx.doi.org/10.1139/cgj-2019-0711 https://cdnsciencepub.com/doi/full-xml/10.1139/cgj-2019-0711 https://cdnsciencepub.com/doi/pdf/10.1139/cgj-2019-0711 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
Canadian Geotechnical Journal volume 58, issue 3, page 351-366 ISSN 0008-3674 1208-6010 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cgj-2019-0711 |
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Canadian Geotechnical Journal |
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58 |
container_issue |
3 |
container_start_page |
351 |
op_container_end_page |
366 |
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1802646809183518720 |