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The effects of disseminated methane hydrate on the dynamic stiffness and damping of a sand

Clayton, C.R.I., Priest, J.A. and Best, A.I. (2005) The effects of disseminated methane hydrate on the dynamic stiffness and damping of a sand Geotechnique, 55, (6), pp. 423-434. (doi:10.1680/geot.2005.55.6.423).

Record type: Article


Methane hydrates are ice-like compounds that can exist only under restricted thermobaric conditions, at low temperatures or under high ambient pressure. They are important because of their potential contributions as a future source of energy, to global warming, and as a possible trigger for long run-out submarine slope instability. This paper describes laboratory experiments to synthesise disseminated methane hydrates and to characterise them under small-strain dynamic loading in the resonant column apparatus. The effects of depositing varying quantities of methane hydrate within a sand are investigated by reference to their shear and bulk modulus, and damping, over a range of isotropic effective stress. Results are compared with those obtained on the same sand without hydrate bonding and after dissociation.
Les hydrates de méthane sont des composés ressemblant à de la glace qui peuvent exister uniquement en conditions thermobariques restreintes, à basse température ou sous une pression ambiante élevée. Ils sont importants en raison de leur contribution potentielle, en tant que future source d'énergie, au réchauffement de la planète, et en tant que déclencheur possible de l'instabilité des longues pentes sous-marines. Cet exposé décrit les expériences en laboratoire visant à synthétiser les hydrates de méthane disséminés et visant à les caractériser sous charge dyna-mique à petite déformation dans l'appareil à colonne de résonance. Nous étudions les effets produits par le dépôt de quantités variables d'hydrate de méthane dans du sable en nous référant à leur module de cisaillement et de compressibilité ainsi qu'au compactage, sur une gamme de contraintes effectives isotropes. Nous comparons les résultats avec ceux obtenus sur le même sable sans adhérence des hydrates et après dissociation.

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Published date: 2005
Keywords: dynamics, laboratory tests, offshore engineering
Organisations: Civil Engineering & the Environment, National Oceanography Centre,Southampton


Local EPrints ID: 20388
ISSN: 0016-8505
PURE UUID: aa784cf7-9b32-4e66-984f-a32a4d88d6ad

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Date deposited: 23 Feb 2006
Last modified: 17 Jul 2017 16:28

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