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Strength Estimation for Hydrate‐Bearing Sediments From Direct Shear Tests of Hydrate‐Bearing Sand and Silt

Geophysical research letters, 2018-01, Vol.45 (2), p.715-723 [Peer Reviewed Journal]

2018. American Geophysical Union. All Rights Reserved. ;ISSN: 0094-8276 ;EISSN: 1944-8007 ;DOI: 10.1002/2017GL076374

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  • Title:
    Strength Estimation for Hydrate‐Bearing Sediments From Direct Shear Tests of Hydrate‐Bearing Sand and Silt
  • Author: Liu, Zhichao ; Dai, Sheng ; Ning, Fulong ; Peng, Li ; Wei, Houzhen ; Wei, Changfu
  • Subjects: Bearing ; Carbon dioxide ; Carbon sequestration ; Cohesion ; Computer simulation ; Data logging ; Dilatancy ; friction ; gas hydrate ; Gas production ; Geomechanics ; Hydrates ; Logging ; Mechanical properties ; Methane ; Reduction ; replacement ; Residual strength ; Saturation ; Sediments ; Seismic velocities ; Sequestering ; Shear strength ; Shear tests ; Silt ; Simulators ; Soil testing ; Stiffness ; Stress ; Stresses ; Wave velocity
  • Is Part Of: Geophysical research letters, 2018-01, Vol.45 (2), p.715-723
  • Description: Safe and economic methane gas production, as well as the replacement of methane while sequestering carbon in natural hydrate deposits, requires enhanced geomechanical understanding of the strength and volume responses of hydrate‐bearing sediments during shear. This study employs a custom‐made apparatus to investigate the mechanical and volumetric behaviors of carbon dioxide hydrate‐bearing sediments subjected to direct shear. The results show that both peak and residual strengths increase with increased hydrate saturation and vertical stress. Hydrate contributes mainly the cohesion and dilatancy constraint to the peak strength of hydrate‐bearing sediments. The postpeak strength reduction is more evident and brittle in specimens with higher hydrate saturation and under lower stress. Significant strength reduction after shear failure is expected in silty sediments with high hydrate saturation Sh ≥ 0.65. Hydrate contribution to the residual strength is mainly by increasing cohesion at low hydrate saturation and friction at high hydrate saturation. Stress state and hydrate saturation are dominating both the stiffness and the strength of hydrate‐bearing sediments; thus, a wave velocity‐based peak strength prediction model is proposed and validated, which allows for precise estimation of the shear strength of hydrate‐bearing sediments through acoustic logging data. This method is advantageous to geomechanical simulators, particularly when the experimental strength data of natural samples are not available. Key Points Hydrate contributes cohesion and dilatancy constraint to peak strength of hydrate‐bearing sediments and mainly friction to residual strength Significant strength reduction after shear failure is expected in silty sediments with hydrate saturation Sh > 0.65 Strength of hydrate‐bearing sediments at in situ can be predicted using acoustic logging data
  • Publisher: Washington: John Wiley & Sons, Inc
  • Language: English
  • Identifier: ISSN: 0094-8276
    EISSN: 1944-8007
    DOI: 10.1002/2017GL076374
  • Source: Wiley Blackwell AGU Digital Archive
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