Strength behavior of methane hydrate bearing sand in undrained triaxial testing

Ghiassian, H.; Grozic, J. L. H.

doi:10.1016/j.marpetgeo.2013.01.007

Cited by 118 publications

(67 citation statements)

References 23 publications

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“…The analysis of stress-strain behavior based on Rowe's stress-dilatancy theory suggests that GHs contribute a structuration effect in GHBS. This effect was substantial in water-limited systems with structuration strength (c′) up to 2 MPa at the onset of dilation and 1.6 MPa at peak strength (Figure 6b and supporting information Table S3), which was high compared to results from other experimental studies with GHBS (e.g., Choi et al, 2018;Ghiassian & Grozic, 2013;Yoneda et al, 2016). However, in water-saturated specimen c′ was substantially lower, reaching values of 0.4 MPa at the onset of dilation and 0.6 MPa at peak strength.…”

Section: 1029/2019gc008458mentioning

confidence: 62%

Strain Rate‐Dependent Hardening‐Softening Characteristics of Gas Hydrate‐Bearing Sediments

Deusner

Gupta

Xie

et al. 2019

Geochem Geophys Geosyst

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The presence of gas hydrates (GHs) increases the stiffness and strength of marine sediments. In elasto‐plastic constitutive models, it is common to consider GH saturation (Sh) as key internal variable for defining the contribution of GHs to composite soil mechanical behavior. However, the stress‐strain behavior of GH‐bearing sediments (GHBS) also depends on the microscale distribution of GH and on GH‐sediment fabrics. A thorough analysis of GHBS is difficult, because there is no unique relation between Sh and GH morphology. To improve the understanding of stress‐strain behavior of GHBS in terms of established soil models, this study summarizes results from triaxial compression tests with different Sh, pore fluids, effective confining stresses, and strain histories. Our data indicate that the mechanical behavior of GHBS strongly depends on Sh and GH morphology, and also on the strain‐induced alteration of GH‐sediment fabrics. Hardening‐softening characteristics of GHBS are strain rate‐dependent, which suggests that GH‐sediment fabrics dynamically rearrange during plastic yielding events. We hypothesize that rearrangement of GH‐sediment fabrics, through viscous deformation or transient dissociation and reformation of GHs, results in kinematic hardening, suppressed softening, and secondary strength recovery, which could potentially mitigate or counteract large‐strain failure events. For constitutive modeling approaches, we suggest that strain rate‐dependent micromechanical effects from alterations of the GH‐sediment fabrics can be lumped into a nonconstant residual friction parameter. We propose simple empirical evolution functions for the mechanical properties and calibrate the model parameters against the experimental data.

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Section: 1029/2019gc008458mentioning

confidence: 62%

Strain Rate‐Dependent Hardening‐Softening Characteristics of Gas Hydrate‐Bearing Sediments

Deusner

Gupta

Xie

et al. 2019

Geochem Geophys Geosyst

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“…Methane gas with a purity of 99.9% and distilled water are used to form MH within the host porous media. The partial water saturation method (Ghiassian and Grozic, 2013) is applied to form hydrate, and the depressurization method is subsequently used to decompose hydrate. Annealing process (Lee et al, 2010a) is performed several times to enhance the homogeneity of hydrate distribution within porous media.…”

Section: Experimental Apparatus and Materialsmentioning

confidence: 99%

“…NGHs have been treated as a potential trigger in submarine geohazards such as wellbore failures, seabed settlements, and submarine landslides (Nixon and Grozic, 2007;Lee et al, 2010b;Maslin et al, 2010;Ning et al, 2012). Therefore, a thorough understanding of deformation characteristics of HBS during depressurization is of great importance for stability analyses under different environmental conditions (Miyazaki et al, 2011;Ghiassian and Grozic, 2013;Zhang et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…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%

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

Liu

Zhang

et al. 2017

Adv. Geo-Energ. Res.

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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.

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“…Some experimental studies investigating mechanical properties of gas hydrate-bearing sediments has been conducted (e.g., Ghiassian and Grozic, 2013;Hyodo et al, 2014;Miyazaki et al, 2011aMiyazaki et al, , 2011bMiyazaki et al, , 2010. They mentioned that the shear strength of hydrate-bearing soils became larger than that of without hydrate.…”

Section: Introductionmentioning

confidence: 99%

Development of a temperature and pressure controlled triaxial apparatus and dissociation tests of carbon dioxide hydrate containing soils

Iwai

Saimyou

Kimoto

et al. 2016

JGS Special Publication

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Methane hydrates are viewed as not only a new energy resource but also a trigger of marine geohazard such as large deformations and landslides of seabed ground. Many researcher have showed that methane hydrate containing sand specimens become stronger than that of without hydrates, however, few study have been performed to investigate the mechanical properties subjected to the hydrate dissociation. The main purpose of our study is to investigate behaviors of the deformation associated with dissociation of the hydrates. In this study, we prepared carbon dioxide hydrate containing specimens and conducted a series of dissociation tests using a heating method under undrained conditions. These experiments require the high pressure and the low temperature conditions to form the carbon dioxide, and we have developed a new triaxial apparatus. The dissociation results indicates that even a small percentage of hydrate saturation produced the large pore gas pressure and the sequential reduction of the effective confining pressure due to the hydrate dissociation, and extensive strain was observed.

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Strength behavior of methane hydrate bearing sand in undrained triaxial testing

Cited by 118 publications

References 23 publications

Strain Rate‐Dependent Hardening‐Softening Characteristics of Gas Hydrate‐Bearing Sediments

Strain Rate‐Dependent Hardening‐Softening Characteristics of Gas Hydrate‐Bearing Sediments

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

Development of a temperature and pressure controlled triaxial apparatus and dissociation tests of carbon dioxide hydrate containing soils

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