A bond contact model for methane hydrate-bearing sediments with interparticle cementation

Abstract

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A bond failure criterion for DEM simulations of cemented geomaterials considering variable bond thickness

“…Although developed from idealized analog soil grains, the proposed bond failure criterion is applicable to realistic geomaterials once the local information (e.g., bond size, bond tensile strength, and bond compressive strength) is numerically reached from an ‘inverse analysis’ based on macroscopic experimental behavior. Such a procedure has been illustrated by several applications of the previous bond contact model attained from similar experimental setting, for instance, DEM modeling of natural sands , methane hydrate‐bearing sands , and rocks . In the spirit of the methodology discussed here, we envisage more realistic applications by extending the approach to 3D space, which will be one of our future works.…”

Thermal instability of gas hydrate bearing sediments: Some issues

“…Deposits in fine grained sediments and other forms of hydrate occurrence have yet to be studied in detail (Jayasinghe and Grozic, 2013). The various growth habits of hydrates within the host sediments has been looked into by various researchers (Helgerud et al, 1999, Waite et al, 2004, Clayton et al, 2005, Lee et al, 2007, Jung and Santamarina, 2012, Jiang et al, 2014. The four most commonly observed hydrate growth habits are (Lee et al, 2007, Waite et al, 2009) (see Fig.…”

A cohesionless micromechanical model for gas hydrate-bearing sediments

“…This method provides an increase of the strength but without a clear effect on the stiffness and dilatation under small strains [1,9,10]. (2) Models in which the hydrate is represented as part of the interparticle constitutive model, where the force displacement relation between different sand particles are a function of the hydrate saturation [14,13,29]. (3) Models in which the hydrate particles are bonded to sand particles, with a considerable effect on initial stiffness and volumetric dilatancy [15,35].…”