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Open AccessArticle

Dilation Behavior of Gas-Saturated Methane-Hydrate Bearing Sand

Structural Engineering Department, Faculty of Engineering Sciences, Ben-Gurion University of the Negev, Hias Building, H3, Office 681, Beer-Sheva 8410501, Israel
Energies 2019, 12(15), 2937; https://doi.org/10.3390/en12152937
Received: 6 June 2019 / Revised: 18 July 2019 / Accepted: 23 July 2019 / Published: 31 July 2019
(This article belongs to the Special Issue Advances in Natural Gas Hydrates)
The geotechnical properties of methane-hydrate-bearing sediments (MHBS) are commonly investigated in the laboratory by using artificial hydrate formations in sandy specimens. Analyses of MHBS saturated with gas or water (in addition to methane-hydrate) showed significant mechanical differences between the two pore-filling states. This paper discusses the unique dilatancy behavior of gas-saturated MHBS, with comparison to water-saturated test results of previously-published works. It is shown that the significant compaction of gas-saturated samples is related to internal tensile forces, which are absent in water-saturated samples. The conceptual link between the internal tensile forces and the compaction characteristics is demonstrated through mechanical differences between pure sand and cemented sand. The paper establishes the link between internal adhesion in gas-saturated MHBS and the unique dilation response by using a stress–dilatancy analysis. View Full-Text
Keywords: methane-hydrate-bearing sands; gas saturated; stress–dilatancy; adhesion methane-hydrate-bearing sands; gas saturated; stress–dilatancy; adhesion
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Pinkert, S. Dilation Behavior of Gas-Saturated Methane-Hydrate Bearing Sand. Energies 2019, 12, 2937.

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