Mechanical behaviors of permafrost-associated methane hydrate-bearing sediments under different mining methods

Yanghui Li, Weiguo Liu, Yiming Zhu, Yunfei Chen, Yongchen Song and Qingping Li

Applied Energy, 2016, vol. 162, issue C, 1627-1632

Abstract: A series of triaxial tests were conducted to investigate the mechanical behaviors of permafrost-associated methane hydrate-bearing sediments under different mining methods (depressurization/heating under exhaust/non-exhaust conditions, CH4–CO2 replacement). The results indicate that both depressurization and heating will decrease the stability of methane hydrate-bearing sediments containing ice which prepared by a mixture method, due to the loss of bearing capacity of methane hydrates and increasing pore pressure; the sediments dissociated under exhaust conditions present much higher failure strength and elastic modulus than those dissociated under non-exhaust conditions, which means that the instability of hydrate-bearing sediments containing ice is likely to be induced more easily in the low permeability regions in certain conditions; the sediments dissociated by depressurization are more stable than those dissociated by heating, due to the effect of ice re-formation under sub-zero conditions; and the failure strength and elastic modulus of methane hydrate-bearing sediments containing ice (mixture method) are slightly lower than that of the CO2 hydrate-bearing sediments containing ice (mixture method) under various conditions, which means that the layers may possibly keep stable when the methane hydrate is completely replaced by CO2 hydrate.

Keywords: Methane hydrate; Depressurization; Heating; CH4–CO2 replacement; Mechanical stability (search for similar items in EconPapers)
Date: 2016
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (14)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0306261915005280
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:appene:v:162:y:2016:i:c:p:1627-1632

Ordering information: This journal article can be ordered from
http://www.elsevier.com/wps/find/journaldescription.cws_home/405891/bibliographic
http://www.elsevier. ... 405891/bibliographic

DOI: 10.1016/j.apenergy.2015.04.065

Access Statistics for this article

Applied Energy is currently edited by J. Yan

More articles in Applied Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().