A densification mechanism to model the mechanical effect of methane hydrates in sandy sediments
SUMMARY Recent pore‐scale observations and geomechanical investigations suggest the lack of true cohesion in methane hydrate‐bearing sediments (MHBSs) and propose that their mechanical behavior is governed by kinematic constrictions at pore‐scale. This paper presents a constitutive model for MHBS, w...
Main Authors: | , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2020
|
Subjects: | |
Online Access: | http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/368098 https://dipot.ulb.ac.be/dspace/bitstream/2013/368098/3/DelaFuente191.pdf |
id |
ftunivbruxelles:oai:dipot.ulb.ac.be:2013/368098 |
---|---|
record_format |
openpolar |
spelling |
ftunivbruxelles:oai:dipot.ulb.ac.be:2013/368098 2024-02-11T10:05:49+01:00 A densification mechanism to model the mechanical effect of methane hydrates in sandy sediments De La Fuente Ruiz, Maria Vaunat, Jean Marín-Moreno, Héctor 2020-04 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/368098 https://dipot.ulb.ac.be/dspace/bitstream/2013/368098/3/DelaFuente191.pdf en eng uri/info:doi/10.1002/nag.3038 https://dipot.ulb.ac.be/dspace/bitstream/2013/368098/3/DelaFuente191.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/368098 1 full-text file(s): info:eu-repo/semantics/openAccess International journal for numerical and analytical methods in geomechanics, 44 (6 Géologie info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2020 ftunivbruxelles 2024-01-24T23:23:26Z SUMMARY Recent pore‐scale observations and geomechanical investigations suggest the lack of true cohesion in methane hydrate‐bearing sediments (MHBSs) and propose that their mechanical behavior is governed by kinematic constrictions at pore‐scale. This paper presents a constitutive model for MHBS, which does not rely on physical bonding between hydrate crystals and sediment grains but on the densification effect that pore invasion with hydrate has on the sediment mechanical properties. The Hydrate‐CASM extends the critical state model Clay and Sand Model (CASM) by implementing the subloading surface model and introducing the densification mechanism. The model suggests that the decrease of the sediment available void volume during hydrate formation stiffens its structure and has a similar mechanical effect as the increase of sediment density. In particular, the model attributes stress‐strain changes observed in MHBS to the variations in sediment available void volume with hydrate saturation and its consequent effect on isotropic yield stress and swelling line slope. The model performance is examined against published experimental data from drained triaxial tests performed at different confining stress and with distinct hydrate saturation and morphology. Overall, the simulations capture the influence of hydrate saturation in both the magnitude and trend of the stiffness, shear strength, and volumetric response of synthetic MHBS. The results are validated against those obtained from previous mechanical models for MHBS that examine the same experimental data. The Hydrate‐CASM performs similarly to previous models, but its formulation only requires one hydrate‐related empirical parameter to express changes in the sediment elastic stiffness with hydrate saturation. info:eu-repo/semantics/published Article in Journal/Newspaper Methane hydrate DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Géologie |
spellingShingle |
Géologie De La Fuente Ruiz, Maria Vaunat, Jean Marín-Moreno, Héctor A densification mechanism to model the mechanical effect of methane hydrates in sandy sediments |
topic_facet |
Géologie |
description |
SUMMARY Recent pore‐scale observations and geomechanical investigations suggest the lack of true cohesion in methane hydrate‐bearing sediments (MHBSs) and propose that their mechanical behavior is governed by kinematic constrictions at pore‐scale. This paper presents a constitutive model for MHBS, which does not rely on physical bonding between hydrate crystals and sediment grains but on the densification effect that pore invasion with hydrate has on the sediment mechanical properties. The Hydrate‐CASM extends the critical state model Clay and Sand Model (CASM) by implementing the subloading surface model and introducing the densification mechanism. The model suggests that the decrease of the sediment available void volume during hydrate formation stiffens its structure and has a similar mechanical effect as the increase of sediment density. In particular, the model attributes stress‐strain changes observed in MHBS to the variations in sediment available void volume with hydrate saturation and its consequent effect on isotropic yield stress and swelling line slope. The model performance is examined against published experimental data from drained triaxial tests performed at different confining stress and with distinct hydrate saturation and morphology. Overall, the simulations capture the influence of hydrate saturation in both the magnitude and trend of the stiffness, shear strength, and volumetric response of synthetic MHBS. The results are validated against those obtained from previous mechanical models for MHBS that examine the same experimental data. The Hydrate‐CASM performs similarly to previous models, but its formulation only requires one hydrate‐related empirical parameter to express changes in the sediment elastic stiffness with hydrate saturation. info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
De La Fuente Ruiz, Maria Vaunat, Jean Marín-Moreno, Héctor |
author_facet |
De La Fuente Ruiz, Maria Vaunat, Jean Marín-Moreno, Héctor |
author_sort |
De La Fuente Ruiz, Maria |
title |
A densification mechanism to model the mechanical effect of methane hydrates in sandy sediments |
title_short |
A densification mechanism to model the mechanical effect of methane hydrates in sandy sediments |
title_full |
A densification mechanism to model the mechanical effect of methane hydrates in sandy sediments |
title_fullStr |
A densification mechanism to model the mechanical effect of methane hydrates in sandy sediments |
title_full_unstemmed |
A densification mechanism to model the mechanical effect of methane hydrates in sandy sediments |
title_sort |
densification mechanism to model the mechanical effect of methane hydrates in sandy sediments |
publishDate |
2020 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/368098 https://dipot.ulb.ac.be/dspace/bitstream/2013/368098/3/DelaFuente191.pdf |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
International journal for numerical and analytical methods in geomechanics, 44 (6 |
op_relation |
uri/info:doi/10.1002/nag.3038 https://dipot.ulb.ac.be/dspace/bitstream/2013/368098/3/DelaFuente191.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/368098 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/openAccess |
_version_ |
1790603015997095936 |