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Effect of Clay Content on the Mechanical Properties of Hydrate-Bearing Sediments during Hydrate Production via Depressurization

1,2, 1,2,3, 1,2,* and 4,5
1
Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
2
Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
3
Nano Science and Technology Institute, University of Science and Technology of China, Suzhou 215123, China
4
School of Earth & Space Science, University of Science and Technology of China, Hefei 230026, China
5
CAS Center for Excellence in Comparative Planetology, Hefei 230026, China
*
Author to whom correspondence should be addressed.
Energies 2019, 12(14), 2684; https://doi.org/10.3390/en12142684
Received: 11 June 2019 / Revised: 8 July 2019 / Accepted: 11 July 2019 / Published: 12 July 2019
(This article belongs to the Special Issue Geomechanics for Energy and a Sustainable Environment)
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Abstract

The effects of sediments with different clay contents on the mechanical properties of hydrate deposits were studied using a high-pressure, low-temperature triaxial apparatus with in-situ synthesis, as well as the mechanical properties of self-developed hydrate sediments. Through multi-stage loading, triaxial compression tests were conducted by adding quartz sand with different clay contents as the sediment skeleton, and the stress–strain relationship of the shearing process and the strength of sediments with different clay contents were determined. Volumetric changes were also observed during shearing. The results show that the strength of hydrate sediments decreases with the increasing clay content of sediments; in the processes of depressurization and shearing, the hydrate samples exhibited obvious shear shrinkage, regardless of the sediment particle size. View Full-Text
Keywords: triaxial shear; methane hydrate; clay content; mechanical property; hydrate mining; shear shrinkage triaxial shear; methane hydrate; clay content; mechanical property; hydrate mining; shear shrinkage
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Li, D.; Wang, Z.; Liang, D.; Wu, X. Effect of Clay Content on the Mechanical Properties of Hydrate-Bearing Sediments during Hydrate Production via Depressurization. Energies 2019, 12, 2684.

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