Discrete element analysis of uplift and lateral capacity of a single pile in methane hydrate bearing sediments

Liu, Fang; Jiang, Mingjing; Fang, Zhu

doi:10.1016/j.compgeo.2014.07.001

Cited by 8 publications

(4 citation statements)

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“…Geomechanics is a key component in the numerical modeling of engineering problems involving HBS. Several types of mechanical constitutive models for hydrate bearing sediment have been proposed in the last few years [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Only a few of them are discussed below.…”

Section: Introductionmentioning

confidence: 99%

“…Kimoto et al [6] proposed an elasto-viscoplastic model to analyze ground deformations induced by hydrate dissociation. The discrete element method has also been used to simulate the mechanical behavior of HBS (e.g., [17][18][19][21][22][23]). All the mechanical models discussed above have been used to simulate tests performed at constant hydrate saturation.…”

Section: Introductionmentioning

confidence: 99%

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A constitutive mechanical model for gas hydrate bearing sediments incorporating inelastic mechanisms

Sánchez

Gai

Santamarina

2017

Computers and Geotechnics

101

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Gas hydrate bearing sediments (HBS) are natural soils formed in permafrost and submarine settings where the temperature and pressure conditions are such that gas hydrates are stable. If these conditions shift from the hydrate stability zone, hydrates dissociate and move from the solid to the gas phase. Hydrate dissociation is accompanied by significant changes in sediment structure and strongly affects its mechanical behavior (e.g. sediment stiffenss, strength and dilatancy). The mechanical behavior of HBS is very complex and its modeling poses great challenges. This paper presents a new geomechanical model for hydrate bearing sediments. The model incorporates the concept of partition stress, plus a number of inelastic mechanisms proposed to capture the complex behavior of this type of soil. This constitutive model is especially well suited to simulate the behavior of HBS upon dissociation. The model was applied and validated against experimental data from triaxial and oedometric tests conducted on manufactured and natural specimens involving different hydrate saturation, hydrate morphology, and confinement conditions. Particular attention was paid to model the HBS behavior during hydrate dissociation under loading. The model performance was highly satisfactory in all the cases studied. It managed to properly capture the main features of HBS mechanical behavior and it also assisted to interpret the behavior of this type of sediment under different loading and hydrate conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A constitutive mechanical model for gas hydrate bearing sediments incorporating inelastic mechanisms

Sánchez

Gai

Santamarina

2017

Computers and Geotechnics

101

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“…However, it is still difficult to reach a consensus with the quantitative point of view. In addition, it can be seen that there are still distinct differences between experimental data and simulations. ,, The cause for the problems, in our opinion, may be the heterogeneity of the synthesized hydrate distribution in the hosted sediments. Currently, the GHBS specimen applied in the triaxial compression tests are remolded in the lab by synthesizing hydrate among the sediments.…”

Section: Introductionmentioning

confidence: 86%

Analysis of Hydrate Heterogeneous Distribution Effects on Mechanical Characteristics of Hydrate-Bearing Sediments

Jian-wu

Kou

et al. 2021

Energy Fuels

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It is reported that hydrate distributes inhomogeneously in synthesized gas hydrate-bearing sediments (GHBS). To investigate the effect of hydrate distribution heterogeneity on the mechanical characteristics of the hydrate-bearing sediments, we modeled the specimens with uniform hydrate saturation but different hydrate distributions and simulated the triaxial compression test process of the specimens using discrete element method (DEM). The hydrate particles were randomly inserted into the specified intergranular void space as in layered pore-filling mode to simulate the heterogeneous distribution. The analyses of the simulation results, including stress−strain curves and volumetric responses, indicated that the heterogeneity of hydrate distribution has great impacts on the mechanical parameters of hydrate-bearing sediments, including the elastics modulus, shear strength, and dilation. The anisotropy of the hydrate heterogeneous distribution effect is also observed. The difference of mechanical properties among the specimens with different hydrate distributions can reach over 15%, which is already comparative to the difference between the hydrate-bearing specimen and the one with twice its hydrate saturation. According to the findings of this work, the effect of hydrate heterogeneous distribution is required to be considered while characterizing the mechanical properties of GHBS.

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“…It has attracted many interests in the geotechnical community [30][31][32]. Holtzman et al [33] simulated the dissociation of MHBS by deleting small particles, and simulated the change of pore water pressure by changing the effective confining pressure.…”

Section: Introductionmentioning

confidence: 99%

DEM simulations of methane hydrate exploitation by thermal recovery and depressurization methods

Jiang

Cui

et al. 2016

Computers and Geotechnics

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Discrete element analysis of uplift and lateral capacity of a single pile in methane hydrate bearing sediments

Cited by 8 publications

References 50 publications

A constitutive mechanical model for gas hydrate bearing sediments incorporating inelastic mechanisms

A constitutive mechanical model for gas hydrate bearing sediments incorporating inelastic mechanisms

Analysis of Hydrate Heterogeneous Distribution Effects on Mechanical Characteristics of Hydrate-Bearing Sediments

DEM simulations of methane hydrate exploitation by thermal recovery and depressurization methods

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