A Chemo-Thermo-Mechanically Coupled Behavior During Gas Hydrate Dissociation and Its Numerical Analysis
Gas hydrates, especially methane hydrates are viewed as a potential energy resource since a large amount of methane gas is trapped mainly within ocean sediments and regions of permafrost. In the present study, gas production process by heating-depressurizing method was simulated. The simulation was conducted for the model with inclined seabed ground with hydrate bearing layer in order to investigate the mechanical behavior during dissociation. The method has been developed based on the chemo-thermo-mechanically coupled analysis, taking into account of the phase changes from solids to fluids, that is, water and gas, the flow of fluids, heat transfer, and the ground deformation (Kimoto et al. 2010). As for the constitutive model for hydrate-bearing sediments, an extended elasto-viscoplastic model for unsaturated soils considering the effect of hydrate bonding is used.
KeywordsGas hydrate Unsaturated soil Numerical analysis
- F. Oka, T. Kodaka, S. Kimoto, Y.-S. Kim, N. Yamasaki, An Elasto-viscoplastic model and multiphase coupled FE analysis for unsaturated soil, in Proceedings of the 4th International Conference on Unsaturated Soils, Carefree, AZ, 2–6 Apr 2006, Geotechnical Special Publication, No. 147, vol. 2 (ASCE, Reston, 2006), pp. 2039–2050.Google Scholar