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Volume 43 Issue 1
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WU Yang, CUI Jie, LIAO Jing-rong, HYODO Masayuki. Experimental study on mechanical characteristics of gas hydrate-bearing sands containing different fines[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(1): 156-164. DOI: 10.11779/CJGE202101018
Citation: WU Yang, CUI Jie, LIAO Jing-rong, HYODO Masayuki. Experimental study on mechanical characteristics of gas hydrate-bearing sands containing different fines[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(1): 156-164. DOI: 10.11779/CJGE202101018
shu

Experimental study on mechanical characteristics of gas hydrate-bearing sands containing different fines

  • 1.

    School of Civil Engineering, Guangzhou University, Guangzhou510006, China

  • 2.

    Guangdong Provincial Engineering and Technology Research Center of Geo-Structure Safety and Protection, Guangzhou510006

  • 3.

    Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Ube7558611, Japan

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  • Received Date: June 16, 2020
  • Available Online: December 04, 2022
    Graphical Abstract
    • Abstract
  • The skeleton structure of gas hydrate-bearing sediments from ocean gas exploitation is composed of coarse grains and fines. A series of low-temperature and high-pressure triaxial drained shear tests are performed to examine the effects of fines and density on the strength and deformation properties of host sands with and without gas hydrate. The results imply that the shear strength and dilation tendency increase with a rise in fines. The rise in fines alerts hydrate morphology and distribution pattern among sand grains. The cluster of coarse grains and fines bonded by hydrate are formed in samples. The shear behavior of host sands exhibits opposite varying tendency with the increasing fines. Moreover, the stress-dilatancy relationship can be modeled using the equation adopted by the modified Cam-clay model and is dependent on hydrate saturation. At a larger hydrate saturation level, the natural samples own a higher peak friction angle and larger increasing speed with the level of gas hydrate than the gas hydrate-bearing samples synthetized in laboratory. The difference is originated from the nucleation mode and distribution pattern of hydrate mass among sand grains.
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    • References (25)
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