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    Mechanical properties of sand, silt, and clay containing tetrahydrofuran hydrate

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    2006JB004484.pdf (1018.Kb)
    Date
    2007-04-17
    Author
    Yun, Tae Sup  Concept link
    Santamarina, J. Carlos  Concept link
    Ruppel, Carolyn D.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3809
    As published
    https://doi.org/10.1029/2006JB004484
    DOI
    10.1029/2006JB004484
    Keyword
     Gas hydrate; Sediment strength; Elasticity; Mechanical behavior; Stiffness 
    Abstract
    The mechanical behavior of hydrate-bearing sediments subjected to large strains has relevance for the stability of the seafloor and submarine slopes, drilling and coring operations, and the analysis of certain small-strain properties of these sediments (for example, seismic velocities). This study reports on the results of comprehensive axial compression triaxial tests conducted at up to 1 MPa confining pressure on sand, crushed silt, precipitated silt, and clay specimens with closely controlled concentrations of synthetic hydrate. The results show that the stress-strain behavior of hydrate-bearing sediments is a complex function of particle size, confining pressure, and hydrate concentration. The mechanical properties of hydrate-bearing sediments at low hydrate concentration (probably < 40% of pore space) appear to be determined by stress-dependent soil stiffness and strength. At high hydrate concentrations (>50% of pore space), the behavior becomes more independent of stress because the hydrates control both stiffness and strength and possibly the dilative tendency of sediments by effectively increasing interparticle coordination, cementing particles together, and filling the pore space. The cementation contribution to the shear strength of hydrate-bearing sediments decreases with increasing specific surface of soil minerals. The lower the effective confining stress, the greater the impact of hydrate formation on normalized strength.
    Description
    Author Posting. © American Geophysical Union, 2007. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 112 (2007): B04106, doi:10.1029/2006JB004484.
    Collections
    • Energy and Geohazards
    Suggested Citation
    Journal of Geophysical Research 112 (2007): B04106
     

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