Mechanical behavior of gas-saturated methane hydrate-bearing sediments

A series of triaxial compression tests were conducted in order to investigate the mechanical behavior of gas‐saturated methane hydrate‐bearing sediments, and a comparison was made between gas‐saturated and water‐saturated specimens. Measurements on gas‐saturated specimens indicate that (1) the large...

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Bibliographic Details
Published in:Journal of geophysical research. Solid earth 2013-10, Vol.118 (10), p.5185-5194
Main Authors: Hyodo, Masayuki, Li, Yanghui, Yoneda, Jun, Nakata, Yukio, Yoshimoto, Norimasa, Nishimura, Akira, Song, Yongchen
Format: Article
Language:English
Subjects:
Confining
Deformation
Earth sciences
Earth, ocean, space
Exact sciences and technology
Failure
gas-saturated
Geophysics
Low temperature
Marine geology
mechanical behavior
Mechanical properties
Methane
methane hydrate
Physical properties of sedimentary rocks
Pore pressure
Porosity
Sedimentary rocks
Sediments
Stiffness
Strain
Strength
Stress-strain curves
Stresses
triaxial test
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Summary:A series of triaxial compression tests were conducted in order to investigate the mechanical behavior of gas‐saturated methane hydrate‐bearing sediments, and a comparison was made between gas‐saturated and water‐saturated specimens. Measurements on gas‐saturated specimens indicate that (1) the larger the methane hydrate saturation, the larger the failure strength and the more apparent the shear dilation behavior; (2) failure strength and stiffness increase with increasing effective confining stress and pore pressure applied during compression, though the specimen becomes less dilative under higher effective confining stress; (3) lower temperatures lead to an increase of the stiffness and failure strength; (4) stiffness of specimens formed under lower pore pressure is higher than that of specimens formed under higher pore pressure but at the same effective stress; (5) stiffness and failure strength of gas‐saturated specimens are higher than those of water‐saturated specimens; (6) gas‐saturated specimens show more apparent strain‐softening behavior and larger volumetric strain than that of water‐saturated specimens. Key Points Mechanical behavior of gas‐saturated hydrate sediments is obtained A comparison is made between gas‐saturated and water‐saturated hydrate sediments The mechanical behavior of the two kinds of specimens is markedly different
ISSN:2169-9313
2169-9356
DOI:10.1002/2013JB010233