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Energies 2018, 11(7), 1819; https://doi.org/10.3390/en11071819

Tri-Axial Shear Tests on Hydrate-Bearing Sediments during Hydrate Dissociation with Depressurization

1,2,3,4
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1,2,3,4,5
,
1,2,3,4,6
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1,2,3,4
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1,2,3,4,* and 1,2,3,4
1
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
2
CAS Key Laboratory of Gas Hydrate, Guangzhou 510640, China
3
Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
4
Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China
5
University of Chinese Academy of Sciences, Beijing 100049, China
6
Nano Science and Technology Institute, University of Science and Technology of China, Suzhou 215123, China
*
Author to whom correspondence should be addressed.
Received: 3 May 2018 / Revised: 21 June 2018 / Accepted: 7 July 2018 / Published: 11 July 2018
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Abstract

A series of tri-axial shear tests were carried out to determine the stress and strain characteristics, as well as the volume deformation of methane hydrate-bearing sediments during gas hydrate dissociation. An innovative type of depressurization was adopted with a high-pressure and low-temperature tri-axial apparatus. Results show that: (1) decrease in pore pressure during the shear process may result in the failure of hydrate-bearing sediments, but they did not collapse completely due to high effective confining pressure; (2) depressurization leads to the contraction of volumetric strain and the ultimate deformation shows no difference compared to that prior depressurization; (3) high saturation hydrate-bearing sediments were more sensitive to depressurization, which could be due to the methane hydrate acting as a skeleton structure at some sites when the pore hydrates’ saturation is high. View Full-Text
Keywords: tri-axial shear test; hydrate-bearing sediments; depressurization; hydrate disassociation tri-axial shear test; hydrate-bearing sediments; depressurization; hydrate disassociation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Li, D.; Wu, Q.; Wang, Z.; Lu, J.; Liang, D.; Li, X. Tri-Axial Shear Tests on Hydrate-Bearing Sediments during Hydrate Dissociation with Depressurization. Energies 2018, 11, 1819.

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