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dc.contributor.authorde la Fuente Ruiz, María
dc.contributor.authorVaunat, Jean
dc.contributor.authorMarín Moreno, Héctor
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental
dc.identifier.citationFuente, M. D. L.; Vaunat, J.; Marín, H. A densification mechanism to model the mechanical effect of methane hydrates in sandy sediments. "International journal for numerical and analytical methods in geomechanics", Abril 2020, vol. 44, núm. 6, p. 782-802.
dc.descriptionThis is the accepted version of the following article: [De La Fuente, M, Vaunat, J, Marín‐Moreno, H. A densification mechanism to model the mechanical effect of methane hydrates in sandy sediments. Int J Numer Anal Methods Geomech. 2019; 1– 21.], which has been published in final form at
dc.description.abstractRecent pore-scale observations and geomechanical investigations suggest the lack of true cohesion in methane hydrate-bearing sediments (MHBSs) and propose that their mechanical behavior is governed by kinematic constrictions at pore-scale. This paper presents a constitutive model for MHBS, which does not rely on physical bonding between hydrate crystals and sediment grains but on the densification effect that pore invasion with hydrate has on the sediment mechanical properties. The Hydrate-CASM extends the critical state model Clay and Sand Model (CASM) by implementing the subloading surface model and introducing the densification mechanism. The model suggests that the decrease of the sediment available void volume during hydrate formation stiffens its structure and has a similar mechanical effect as the increase of sediment density. In particular, the model attributes stress-strain changes observed in MHBS to the variations in sediment available void volume with hydrate saturation and its consequent effect on isotropic yield stress and swelling line slope. The model performance is examined against published experimental data from drained triaxial tests performed at different confining stress and with distinct hydrate saturation and morphology. Overall, the simulations capture the influence of hydrate saturation in both the magnitude and trend of the stiffness, shear strength, and volumetric response of synthetic MHBS. The results are validated against those obtained from previous mechanical models for MHBS that examine the same experimental data. The Hydrate-CASM performs similarly to previous models, but its formulation only requires one hydrate-related empirical parameter to express changes in the sediment elastic stiffness with hydrate saturation
dc.subjectÀrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòls
dc.subject.lcshSoil mechanics
dc.subject.otherDensification mechanism
dc.subject.otherConstitutive modeling
dc.subject.otherMechanical behavior
dc.subject.otherMethane hydrate-bearing sediments
dc.titleA densification mechanism to model the mechanical effect of methane hydrates in sandy sediments
dc.subject.lemacMecànica dels sòls
dc.contributor.groupUniversitat Politècnica de Catalunya. MSR - Mecànica del Sòls i de les Roques
dc.description.peerreviewedPeer Reviewed
dc.rights.accessRestricted access - publisher's policy
dc.description.versionPostprint (author's final draft)
local.citation.authorFuente, M. de la; Vaunat, J.; Marín, H.
local.citation.publicationNameInternational journal for numerical and analytical methods in geomechanics

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