Triaxial shear test and strain analysis of unconsolidated hydrate-bearing sediments

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  • 1.The Key Laboratory of Gas Hydrate,Ministry of Land and Resources,Qingdao Institute of Marine Geology,
    Qingdao 266071,China;2.Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Scienceand Technology,Qingdao 266071,China;
    3.Ocean University of China,Qingdao 266100,China

Received date: 2016-10-27

  Revised date: 2017-01-21

  Online published: 2017-03-10

Abstract

Triaxial shear test is one of the effective ways to obtain strength parameters of hydrate-bearing sediment.Both volumetric strain and lateral strain were analyzed through triaxial shear test of unconsolidated hydrate-bearing sediments.A series of new semi-empirical equations were provided for axial-volumetric strain,axial-lateral strain and corresponding model parameters.Based on these analyses,critical failure mode prediction method was firstly provided.The results show that,in case of constant initial void ratio,failure mode of hydrate-bearing sediment is controlled by several parameters,such as effective confining pressure,hydrate saturation.The failure mode prediction method provided in this paper fits well with the experimental data.Furthermore,different model coefficients' effects on strain relationships are different,probing into the physical meaning of each coefficient is essential for further understanding of strain relationships.

Cite this article

Li Yan-long,Liu Chang-ling,Liu Le-le,Huang Meng,Meng Qing-guo . Triaxial shear test and strain analysis of unconsolidated hydrate-bearing sediments[J]. Natural Gas Geoscience, 2017 , 28(3) : 383 -390 . DOI: 10.11764/j.issn.1672-1926.2017.01.012

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