Stability Analysis of Methane Hydrate-Bearing Soils Considering Dissociation
It is well known that the methane hydrate dissociation process may lead to unstable behavior such as large ground deformations, uncontrollable gas production, etc. A linear instability analysis was performed in order to investigate which variables have a significant effect on the onset of the instab...
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ftmdpi:oai:mdpi.com:/1996-1073/8/6/5381/ 2023-08-20T04:07:56+02:00 Stability Analysis of Methane Hydrate-Bearing Soils Considering Dissociation Hiromasa Iwai Sayuri Kimoto Toshifumi Akaki Fusao Oka 2015-06-05 application/pdf https://doi.org/10.3390/en8065381 EN eng Multidisciplinary Digital Publishing Institute https://dx.doi.org/10.3390/en8065381 https://creativecommons.org/licenses/by/4.0/ Energies; Volume 8; Issue 6; Pages: 5381-5412 methane hydrate-bearing soil dissociation process linear stability analysis chemo-thermo-mechanically coupled analysis Text 2015 ftmdpi https://doi.org/10.3390/en8065381 2023-07-31T20:44:10Z It is well known that the methane hydrate dissociation process may lead to unstable behavior such as large ground deformations, uncontrollable gas production, etc. A linear instability analysis was performed in order to investigate which variables have a significant effect on the onset of the instability behavior of methane hydrate-bearing soils subjected to dissociation. In the analysis a simplified viscoplastic constitutive equation is used for the soil sediment. The stability analysis shows that the onset of instability of the material system mainly depends on the strain hardening-softening parameter, the degree of strain, and the permeability for water and gas. Then, we conducted a numerical analysis of gas hydrate-bearing soil considering hydrate dissociation in order to investigate the effect of the parameters on the system. The simulation method used in the present study can describe the chemo-thermo-mechanically coupled behaviors such as phase changes from hydrates to water and gas, temperature changes and ground deformation. From the numerical results, we found that basically the larger the permeability for water and gas is, the more stable the simulation results are. These results are consistent with those obtained from the linear stability analysis. Text Methane hydrate MDPI Open Access Publishing Energies 8 6 5381 5412 |
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MDPI Open Access Publishing |
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topic |
methane hydrate-bearing soil dissociation process linear stability analysis chemo-thermo-mechanically coupled analysis |
spellingShingle |
methane hydrate-bearing soil dissociation process linear stability analysis chemo-thermo-mechanically coupled analysis Hiromasa Iwai Sayuri Kimoto Toshifumi Akaki Fusao Oka Stability Analysis of Methane Hydrate-Bearing Soils Considering Dissociation |
topic_facet |
methane hydrate-bearing soil dissociation process linear stability analysis chemo-thermo-mechanically coupled analysis |
description |
It is well known that the methane hydrate dissociation process may lead to unstable behavior such as large ground deformations, uncontrollable gas production, etc. A linear instability analysis was performed in order to investigate which variables have a significant effect on the onset of the instability behavior of methane hydrate-bearing soils subjected to dissociation. In the analysis a simplified viscoplastic constitutive equation is used for the soil sediment. The stability analysis shows that the onset of instability of the material system mainly depends on the strain hardening-softening parameter, the degree of strain, and the permeability for water and gas. Then, we conducted a numerical analysis of gas hydrate-bearing soil considering hydrate dissociation in order to investigate the effect of the parameters on the system. The simulation method used in the present study can describe the chemo-thermo-mechanically coupled behaviors such as phase changes from hydrates to water and gas, temperature changes and ground deformation. From the numerical results, we found that basically the larger the permeability for water and gas is, the more stable the simulation results are. These results are consistent with those obtained from the linear stability analysis. |
format |
Text |
author |
Hiromasa Iwai Sayuri Kimoto Toshifumi Akaki Fusao Oka |
author_facet |
Hiromasa Iwai Sayuri Kimoto Toshifumi Akaki Fusao Oka |
author_sort |
Hiromasa Iwai |
title |
Stability Analysis of Methane Hydrate-Bearing Soils Considering Dissociation |
title_short |
Stability Analysis of Methane Hydrate-Bearing Soils Considering Dissociation |
title_full |
Stability Analysis of Methane Hydrate-Bearing Soils Considering Dissociation |
title_fullStr |
Stability Analysis of Methane Hydrate-Bearing Soils Considering Dissociation |
title_full_unstemmed |
Stability Analysis of Methane Hydrate-Bearing Soils Considering Dissociation |
title_sort |
stability analysis of methane hydrate-bearing soils considering dissociation |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2015 |
url |
https://doi.org/10.3390/en8065381 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
Energies; Volume 8; Issue 6; Pages: 5381-5412 |
op_relation |
https://dx.doi.org/10.3390/en8065381 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/en8065381 |
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Energies |
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8 |
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6 |
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5381 |
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5412 |
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1774719929701892096 |