A simple distinct element modeling of the mechanical behavior of methane hydrate-bearing sediments in deep seabed

Jiang, Mingjing; Ya, Sun; Yang, Qianqian

doi:10.1007/s10035-013-0399-7

Cited by 48 publications

(16 citation statements)

References 46 publications

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“…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.…”

Section: Discussionmentioning

confidence: 98%

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

Jiang

Liu

Zhou

2014

Num Anal Meth Geomechanics

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SUMMARY A series of micromechanical tests were conducted to investigate the bond failure criterion of bonded granules considering the effect of bond thickness, with the aim of enhancing the bond contact model used in the distinct element simulations of cemented geomaterials. The granules were idealized in a two‐dimensional context as one pair of aluminum rods bonded by resin epoxy or cement. The mechanical responses of nearly 500 rod pairs were tested under different loading paths to attain the yield loads of bonded granules at variable bond thickness. This study leads to a generic bond failure criterion incorporating the effect of the bond thickness. The results show that the bond compressive resistance largely decreases with increasing bond thickness owing to the presence of the confinement at the bond‐particle interface. The strength envelopes obtained from the combined shear compression tests and combined torsion compression tests have identical functional form, and they decrease in size with increasing bond thickness but remain unchanged in shape. Given the same cementation material, the generic bond strength envelope in a three‐dimensional contact force space under different loading paths remains the same in shape but shrinks with the increase of bond thickness. Copyright © 2014 John Wiley & Sons, Ltd.

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Section: Discussionmentioning

confidence: 98%

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

Jiang

Liu

Zhou

2014

Num Anal Meth Geomechanics

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“…The results indicated that: different GHBS preparation methods such as gas saturated method and water saturated method lead to obvious differences in the mechanical behavior; the GH existence mode in the pores of sediments varies with the increase of GH saturation, leading to the transition of the deformation from shear shrinkage to shear dilatancy. Constitutive models were established to describe the mechanical behaviors of GHBS by using linear elastic or nonlinear elasto-plastic models, such as the Discrete Element Method, Duncan-Chang model, Cam-clay model [16][17][18][19][20]. Those models can consider two or three phases in GHBS, but are incapable of describing the effects of GH dissociation.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of gas hydrate-bearing sediments during hydrate dissociation

Zhang

Luo

et al. 2017

Acta Mech. Sin.

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The changes in the mechanical properties of gas hydrate-bearing sediments (GHBS) induced by gas hydrate (GH) dissociation are essential to the evaluation of GH exploration and stratum instabilities. Previous studies present substantial mechanical data and constitutive models for GHBS at a given GH saturation under the non-dissociated condition. In this paper, GHBS was formed by the gas saturated method, GH was dissociated by depressurization until the GH saturation reached different dissociation degrees. The stress-strain curves were measured using triaxial tests at a same pore gas pressure and different confining pressures. The results show that the shear strength decreases progressively by 30%-90% of the initial value with GH dissociation, and the modulus decreases by 50%-75%. Simplified relationships for the modulus, cohesion, and internal friction angle with GH dissociated saturation were presented.

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“…In the cementation model [17,18], hydrates nucleate at inter-granular contacts and the existing soil skeleton structure is cemented by the hydrates, while the soil-soil (s-s) contacts are not bonded. In most of the previous DEM studies simulating the behaviour of methane hydrate soils [15][16][17][18][19][20], it was assumed that all the soil and hydrate particles were spheres. However, it is well known that the shape of soil particles has a large influence on its mechanical behaviour [17,21,22].…”

Section: Introductionmentioning

confidence: 99%

Discrete element modelling of methane hydrate soil sediments using elongated soil particles

Cheng

et al. 2016

Computers and Geotechnics

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In this Discrete Element Modelling research, triaxial compression tests of particle assemblies were simulated to study the mechanical behaviour of methane hydrate sediments with two different hydrate formation patterns: pore-filling and cementation. The soil particles were modelled using spherical or elongated particles (two aspect ratios 1.5 and 2.0). Hydrates were modelled as smaller particles and were placed either inside the pores in a random manner (the pore-filling case) or around the soil particle contacts (the cementation case). Compared to the pure soil samples, the hydrates essentially influenced the mechanical behaviour of the hydrate-bearing soil samples, and the behaviours varied due to the different hydrate growth patterns. The behaviour with elongated soil particles is much closer to that of the natural hydrate-bearing sandy sediments retrieved from the Nankai Trough than the behaviour with spherical particles. The observed macroscopic strength behaviour is also explained by the microscopic contact-type related contributions (soil-soil contact, soil-hydrate contact and hydrate-hydrate contact) to the deviatoric stresses.

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A simple distinct element modeling of the mechanical behavior of methane hydrate-bearing sediments in deep seabed

Cited by 48 publications

References 46 publications

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

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

Mechanical properties of gas hydrate-bearing sediments during hydrate dissociation

Discrete element modelling of methane hydrate soil sediments using elongated soil particles

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