Modeling the Mechanical Behavior of Methane Hydrate-Bearing Sand Using the Equivalent Granular Void Ratio
For the safe extraction of methane from hydrate reservoirs, modeling the mechanical behavior of the methane hydrate-bearing soil properly is crucial in order to enable designers to analysis hydrate-dissociation-induced geotechnical failures. Hydrate morphology is one of major factors affecting the m...
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Multidisciplinary Digital Publishing Institute
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ftmdpi:oai:mdpi.com:/2077-1312/10/8/1040/ 2023-08-20T04:07:56+02:00 Modeling the Mechanical Behavior of Methane Hydrate-Bearing Sand Using the Equivalent Granular Void Ratio Jie Shen Abraham C. F. Chiu Charles Wang Wai Ng agris 2022-07-28 application/pdf https://doi.org/10.3390/jmse10081040 EN eng Multidisciplinary Digital Publishing Institute Marine Energy https://dx.doi.org/10.3390/jmse10081040 https://creativecommons.org/licenses/by/4.0/ Journal of Marine Science and Engineering; Volume 10; Issue 8; Pages: 1040 methane hydrate sand combined model equivalent granular void ratio Text 2022 ftmdpi https://doi.org/10.3390/jmse10081040 2023-08-01T05:53:01Z For the safe extraction of methane from hydrate reservoirs, modeling the mechanical behavior of the methane hydrate-bearing soil properly is crucial in order to enable designers to analysis hydrate-dissociation-induced geotechnical failures. Hydrate morphology is one of major factors affecting the mechanical behavior of soil containing hydrate. This paper presents a new constitutive model for methane hydrate-bearing sand (MHBS) using the equivalent granular void ratio as a state variable, which can quantify the effects of the pore-filling and load-bearing hydrate morphology under a unifying framework. The proposed model is a combination of generalized plasticity and an elastic damage model so as to take into account the observed frictional and bonding aspects of MHBS, respectively. By using the concept of state-dependent dilatancy, the equivalent granular void ratio is formulated and adopted in the generalized plasticity model. In addition, a nonlinear damage function is implemented to elucidate the degradation of hydrate bonds with respect to shearing. Compared with the basic generalized plasticity model for host sand, only three additional parameters are required to capture key mechanical behaviors of MHBS. By comparing the triaxial test results of MHBS synthesized from a range of host sands with a predicted behavior by the proposed model, it is demonstrated that the new model can satisfactorily capture the stress–strain and volumetric behavior of MHBS under different hydrate saturations, confining pressures, and void ratios. Text Methane hydrate MDPI Open Access Publishing Journal of Marine Science and Engineering 10 8 1040 |
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English |
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methane hydrate sand combined model equivalent granular void ratio |
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methane hydrate sand combined model equivalent granular void ratio Jie Shen Abraham C. F. Chiu Charles Wang Wai Ng Modeling the Mechanical Behavior of Methane Hydrate-Bearing Sand Using the Equivalent Granular Void Ratio |
topic_facet |
methane hydrate sand combined model equivalent granular void ratio |
description |
For the safe extraction of methane from hydrate reservoirs, modeling the mechanical behavior of the methane hydrate-bearing soil properly is crucial in order to enable designers to analysis hydrate-dissociation-induced geotechnical failures. Hydrate morphology is one of major factors affecting the mechanical behavior of soil containing hydrate. This paper presents a new constitutive model for methane hydrate-bearing sand (MHBS) using the equivalent granular void ratio as a state variable, which can quantify the effects of the pore-filling and load-bearing hydrate morphology under a unifying framework. The proposed model is a combination of generalized plasticity and an elastic damage model so as to take into account the observed frictional and bonding aspects of MHBS, respectively. By using the concept of state-dependent dilatancy, the equivalent granular void ratio is formulated and adopted in the generalized plasticity model. In addition, a nonlinear damage function is implemented to elucidate the degradation of hydrate bonds with respect to shearing. Compared with the basic generalized plasticity model for host sand, only three additional parameters are required to capture key mechanical behaviors of MHBS. By comparing the triaxial test results of MHBS synthesized from a range of host sands with a predicted behavior by the proposed model, it is demonstrated that the new model can satisfactorily capture the stress–strain and volumetric behavior of MHBS under different hydrate saturations, confining pressures, and void ratios. |
format |
Text |
author |
Jie Shen Abraham C. F. Chiu Charles Wang Wai Ng |
author_facet |
Jie Shen Abraham C. F. Chiu Charles Wang Wai Ng |
author_sort |
Jie Shen |
title |
Modeling the Mechanical Behavior of Methane Hydrate-Bearing Sand Using the Equivalent Granular Void Ratio |
title_short |
Modeling the Mechanical Behavior of Methane Hydrate-Bearing Sand Using the Equivalent Granular Void Ratio |
title_full |
Modeling the Mechanical Behavior of Methane Hydrate-Bearing Sand Using the Equivalent Granular Void Ratio |
title_fullStr |
Modeling the Mechanical Behavior of Methane Hydrate-Bearing Sand Using the Equivalent Granular Void Ratio |
title_full_unstemmed |
Modeling the Mechanical Behavior of Methane Hydrate-Bearing Sand Using the Equivalent Granular Void Ratio |
title_sort |
modeling the mechanical behavior of methane hydrate-bearing sand using the equivalent granular void ratio |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2022 |
url |
https://doi.org/10.3390/jmse10081040 |
op_coverage |
agris |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
Journal of Marine Science and Engineering; Volume 10; Issue 8; Pages: 1040 |
op_relation |
Marine Energy https://dx.doi.org/10.3390/jmse10081040 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/jmse10081040 |
container_title |
Journal of Marine Science and Engineering |
container_volume |
10 |
container_issue |
8 |
container_start_page |
1040 |
_version_ |
1774719931220230144 |