For the safe extraction of methane from hydrate reservoirs, modeling mechanical behavior hydrate-bearing soil properly is crucial in order to enable designers analysis hydrate-dissociation-induced geotechnical failures. Hydrate morphology one major factors affecting containing hydrate. This paper presents a new constitutive model for sand (MHBS) using equivalent granular void ratio as state var...

Abstract Determination of the youngest active domains in fault zones that are not overlain by Quaternary sedimentary cover is critical for evaluating recent activity, determining current local stress field, and mitigating impacts future earthquakes. Considering exhumation a zone, domain zone supposed to correspond activity at minimum depth buried fault, such most vulnerable area, which possesse...

Plastic constitutive relations are derived for a class of anisotropic porous materials consisting of coaxial spheroidal voids, arbitrarily oriented relative to the embedding orthotropic matrix. The derivations are based on nonlinear homogenization, limit analysis and micromechanics. A variational principle is formulated for the yield criterion of the effective medium and specialized to a sphero...