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Energies 2015, 8(6), 5381-5412;

Stability Analysis of Methane Hydrate-Bearing Soils Considering Dissociation

Department of Architecture, Civil Engineering and Industrial Management Engineering, Nagoya Institute of Technology, Building-16, room-226, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
Department of Civil & Earth Resources Engineering, Kyoto University, Kyotodaigaku Katsura 4, Nishikyo-ku, Kyoto 615-8540, Japan
Kyoto University, Tanaka-Asukai-cho 138-1, Sakyo-ku, Kyoto 606-8226, Japan
Former Ph.D. student of Kyoto University.
Author to whom correspondence should be addressed.
Academic Editor: Richard B. Coffin
Received: 11 February 2015 / Revised: 26 May 2015 / Accepted: 29 May 2015 / Published: 5 June 2015
(This article belongs to the Special Issue Coastal Ocean Natural Gas Hydrate 2014)
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It is well known that the methane hydrate dissociation process may lead to unstable behavior such as large ground deformations, uncontrollable gas production, etc. A linear instability analysis was performed in order to investigate which variables have a significant effect on the onset of the instability behavior of methane hydrate-bearing soils subjected to dissociation. In the analysis a simplified viscoplastic constitutive equation is used for the soil sediment. The stability analysis shows that the onset of instability of the material system mainly depends on the strain hardening-softening parameter, the degree of strain, and the permeability for water and gas. Then, we conducted a numerical analysis of gas hydrate-bearing soil considering hydrate dissociation in order to investigate the effect of the parameters on the system. The simulation method used in the present study can describe the chemo-thermo-mechanically coupled behaviors such as phase changes from hydrates to water and gas, temperature changes and ground deformation. From the numerical results, we found that basically the larger the permeability for water and gas is, the more stable the simulation results are. These results are consistent with those obtained from the linear stability analysis. View Full-Text
Keywords: methane hydrate-bearing soil; dissociation process; linear stability analysis; chemo-thermo-mechanically coupled analysis methane hydrate-bearing soil; dissociation process; linear stability analysis; chemo-thermo-mechanically coupled analysis

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Iwai, H.; Kimoto, S.; Akaki, T.; Oka, F. Stability Analysis of Methane Hydrate-Bearing Soils Considering Dissociation. Energies 2015, 8, 5381-5412.

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