DEM simulation of coexistence type methane hydrate bearing sediments
The hydrate morphology in sandy methane hydrate (MH)-bearing sediment (MHBS) is commonly classified as pore-filling, cementation, grain-coating and load-bearing. This paper presents a numerical investigation into the mechanical behaviour of coexistence-type MHBS using the discrete-element method (DE...
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2023
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Online Access: | http://dx.doi.org/10.1680/jenge.19.00066 https://www.icevirtuallibrary.com/doi/pdf/10.1680/jenge.19.00066 |
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crtelford:10.1680/jenge.19.00066 2024-06-23T07:54:37+00:00 DEM simulation of coexistence type methane hydrate bearing sediments Liu, Jun Jiang, Mingjing 2023 http://dx.doi.org/10.1680/jenge.19.00066 https://www.icevirtuallibrary.com/doi/pdf/10.1680/jenge.19.00066 en eng Thomas Telford Ltd. Environmental Geotechnics volume 10, issue 3, page 206-217 ISSN 2051-803X journal-article 2023 crtelford https://doi.org/10.1680/jenge.19.00066 2024-05-30T08:22:20Z The hydrate morphology in sandy methane hydrate (MH)-bearing sediment (MHBS) is commonly classified as pore-filling, cementation, grain-coating and load-bearing. This paper presents a numerical investigation into the mechanical behaviour of coexistence-type MHBS using the discrete-element method (DEM). The coexistence type is represented as a combination of pore-filling and cementation types. For MHBS with a given MH saturation (S MH ), the relative content of pore-filling and cementation is characterised by the cement ratio λ (λ = 0 means pure pore-filling and λ = 1 means pure cementation). A series of drained triaxial compression tests is simulated, and micromechanical variables such as bond breakage are examined. The results show that (a) the strength and dilatancy of the coexistence-type MHBS are higher when the cement ratio is larger. The normalised strength and secant modulus increase linearly with the cement ratio. (b) When the cement ratio increases, the critical-state line on the mineral void ratio e cr –ln p′ projection shifts towards a higher position and the bond breakage ratio is larger. (c) The shear stress of the coexistence-type MHBS with cementation is affected by the MH generation process due to the MH bond breakages. Article in Journal/Newspaper Methane hydrate ICE Virtual Library (ICE Publishing) Environmental Geotechnics 1 10 |
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Open Polar |
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ICE Virtual Library (ICE Publishing) |
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crtelford |
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English |
description |
The hydrate morphology in sandy methane hydrate (MH)-bearing sediment (MHBS) is commonly classified as pore-filling, cementation, grain-coating and load-bearing. This paper presents a numerical investigation into the mechanical behaviour of coexistence-type MHBS using the discrete-element method (DEM). The coexistence type is represented as a combination of pore-filling and cementation types. For MHBS with a given MH saturation (S MH ), the relative content of pore-filling and cementation is characterised by the cement ratio λ (λ = 0 means pure pore-filling and λ = 1 means pure cementation). A series of drained triaxial compression tests is simulated, and micromechanical variables such as bond breakage are examined. The results show that (a) the strength and dilatancy of the coexistence-type MHBS are higher when the cement ratio is larger. The normalised strength and secant modulus increase linearly with the cement ratio. (b) When the cement ratio increases, the critical-state line on the mineral void ratio e cr –ln p′ projection shifts towards a higher position and the bond breakage ratio is larger. (c) The shear stress of the coexistence-type MHBS with cementation is affected by the MH generation process due to the MH bond breakages. |
format |
Article in Journal/Newspaper |
author |
Liu, Jun Jiang, Mingjing |
spellingShingle |
Liu, Jun Jiang, Mingjing DEM simulation of coexistence type methane hydrate bearing sediments |
author_facet |
Liu, Jun Jiang, Mingjing |
author_sort |
Liu, Jun |
title |
DEM simulation of coexistence type methane hydrate bearing sediments |
title_short |
DEM simulation of coexistence type methane hydrate bearing sediments |
title_full |
DEM simulation of coexistence type methane hydrate bearing sediments |
title_fullStr |
DEM simulation of coexistence type methane hydrate bearing sediments |
title_full_unstemmed |
DEM simulation of coexistence type methane hydrate bearing sediments |
title_sort |
dem simulation of coexistence type methane hydrate bearing sediments |
publisher |
Thomas Telford Ltd. |
publishDate |
2023 |
url |
http://dx.doi.org/10.1680/jenge.19.00066 https://www.icevirtuallibrary.com/doi/pdf/10.1680/jenge.19.00066 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
Environmental Geotechnics volume 10, issue 3, page 206-217 ISSN 2051-803X |
op_doi |
https://doi.org/10.1680/jenge.19.00066 |
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Environmental Geotechnics |
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