Effects of dissociation on the shear strength and deformation behavior of methane hydrate-bearing sediments

Hyodo, Masayuki; Li, Yanghui; Yoneda, Jun; Nakata, Yoshihiro; Yoshimoto, Nobuko; Nishimura, Akira

doi:10.1016/j.marpetgeo.2013.11.015

Cited by 194 publications

(106 citation statements)

References 39 publications

Supporting

Mentioning

102

Contrasting

Order By: Relevance

“…A vast variety of triaxial shear tests have been performed on HBS to understand the stress-strain behavior under different hydrate saturations (Yun et al, 2007;Miyazaki et al, 2011;Zhang et al, 2012;Ghiassian and Grozic, 2013;Hyodo et al, 2013;Hyodo et al, 2014;Li et al, 2016). Based on these experimental data, various constitutive models of HBS have been proposed and improved (Pinkert and Grozic, 2014;Lin et al, 2015;Pinkert et al, 2015;Sun et al, 2015;Shen et al, 2016;Uchida et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Numerical simulations for analyzing deformation characteristics of hydrate-bearing sediments during depressurization

Liu

Zhang

et al. 2017

Adv. Geo-Energ. Res.

View full text Add to dashboard Cite

Natural gas hydrates have been treated as a potential energy resource for decades. Understanding geomechanical properties of hydrate-bearing porous media is an essential to protect the safety of individuals and devices during hydrate production. In this work, a numerical simulator named GrapeFloater is developed to study the deformation behavior of hydrate-bearing porous media during depressurization, and the numerical simulator couples multiple processes such as conductive-convective heat transfer, two-phase fluid flow, intrinsic kinetics of hydrate dissociation, and deformation of solid skeleton. Then, a depressurization experiment is carried out to validate the numerical simulator. A parameter sensitivity analysis is performed to discuss the deformation behavior of hydrate-bearing porous media as well as its effect on production responses. Conclusions are drawn as follows: the numerical simulator named GrapeFloater predicts the experimental results well; the modulus of hydrate-bearing porous media has an obvious effect on production responses; final deformation increases with decreasing outlet pressure; both the depressurization and the modulus decrease during hydrate dissociation contribute to the deformation of hydrate-bearing porous media.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical simulations for analyzing deformation characteristics of hydrate-bearing sediments during depressurization

Liu

Zhang

et al. 2017

Adv. Geo-Energ. Res.

View full text Add to dashboard Cite

show abstract

“…The necessary and sufficient conditions whereby the all the roots have negative real parts are given by the Routh-Hurwitz criteria. When the coefficient of the highest order of ω is positive, that is, 5 0 a  , the necessary and sufficient conditions that all the roots have negative real parts are to satisfy all the equations from (i) to (iv) expressed below. …”

Section: Conditions Of Onset Of Materials Instabilitymentioning

confidence: 99%

“…In general, the material system is likely to be stable when it is in the viscoplastic hardening regions [18,19]. Of course, conditions of the onset of the material instability depends on not only the sign for 5 a and 0 a but also the other coefficients. The main point of this analysis is that the material instability may occur even in the viscoplastic hardening regions, in the case of the expansive strain.…”

Section: Sign For the Coefficients 5 A And 0 Amentioning

confidence: 99%

“…Many experimental and numerical studies have been conducted on the deformation behavior associated with methane hydrate dissociation [5][6][7][8][9][10]. Nevertheless, the behavior of methane hydrate-bearing soils during dissociation is still a subject of active research, and theoretical analyses to investigate the onset of instability, such as linear stability analyses, have not been performed.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Stability Analysis of Methane Hydrate-Bearing Soils Considering Dissociation

et al. 2015

View full text Add to dashboard Cite

Abstract:It is well known that the methane hydrate dissociation process may lead to unstable behavior such as large ground deformations, uncontrollable gas production, etc. A linear instability analysis was performed in order to investigate which variables have a significant effect on the onset of the instability behavior of methane hydrate-bearing soils subjected to dissociation. In the analysis a simplified viscoplastic constitutive equation is used for the soil sediment. The stability analysis shows that the onset of instability of the material system mainly depends on the strain hardening-softening parameter, the degree of strain, and the permeability for water and gas. Then, we conducted a numerical analysis of gas hydrate-bearing soil considering hydrate dissociation in order to investigate the effect of the parameters on the system. The simulation method used in the present study can describe the chemo-thermo-mechanically coupled behaviors such as phase changes from hydrates to water and gas, temperature changes and ground deformation. From the numerical results, we found that basically the larger the permeability for water and gas is, the more stable the simulation results are. These results are consistent with those obtained from the linear stability analysis. OPEN ACCESSEnergies 2015, 8 5382

show abstract

“…The expansion of the hydrate dissociation zone will greatly reduce the stiffness and strength of the hydrate-bearing sediment (HBS) (Lu et al, 2008a(Lu et al, , 2008bSong et al, 2014;Jiang et al, 2014;Hyodo et al, 2014;Zhang et al, 2015a). Excess pore fluid pressure develops in a low permeability hydrate stratum.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of soil stratum instability induced by hydrate dissociation

Zhang

Chen

et al. 2016

Ocean Engineering

View full text Add to dashboard Cite

a b s t r a c tGas hydrate dissociation may lead to soil stratum instability such as marine landslides in hydrate-bearing sediments. In this paper, centrifugal tests were conducted to investigate the soil responses and stratum instability of a 14°slope during hydrate dissociation under centrifugal accelerations of 50g and 100g, different boundary conditions and heating modes. New phenomena such as sliding of the over layer, layered fractures between the hydrate layer and the over layer, and fractures in the over layer were observed. The fluid pressures, horizontal displacements and vertical displacements of the soils were measured and compared under different conditions. The observed mechanisms and decoupled formulations considering heat transfer, fluid seepage, soil deformation and critical soil failure were presented and discussed. The formation of layered fractures during hydrate dissociation is regarded as an important factor leading to the instability of the slope.

show abstract

Effects of dissociation on the shear strength and deformation behavior of methane hydrate-bearing sediments

Cited by 194 publications

References 39 publications

Numerical simulations for analyzing deformation characteristics of hydrate-bearing sediments during depressurization

Numerical simulations for analyzing deformation characteristics of hydrate-bearing sediments during depressurization

Stability Analysis of Methane Hydrate-Bearing Soils Considering Dissociation

Mechanism of soil stratum instability induced by hydrate dissociation

Contact Info

Product

Resources

About