A Nonlinear Elastic Model for Triaxial Compressive Properties of Artificial Methane-Hydrate-Bearing Sediment Samples

Miyazaki, Kazuyuki; Tenma, Norio; Aoki, Katsumi; Yamaguchi, Tsutomu

doi:10.3390/en5104057

Cited by 112 publications

(101 citation statements)

References 11 publications

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“…The formation procedure of methane hydrate‐bearing sediments is briefly described here. Methane hydrate was formed by a partial water saturation method which was employed in previous studies (Ebinuma et al, ; Kneafsey et al, ; Masui et al, ; Miyazaki et al, ; Priest et al, ; Waite et al, ). The unsaturated specimens containing different amounts of FC were initially prepared by adding a specific water content into the pure sand and sand‐silty mixture to attain the target methane hydrate saturation S MH = 50%.…”

Section: Methodsmentioning

confidence: 99%

Influence of Fines Content on the Mechanical Behavior of Methane Hydrate‐Bearing Sediments

et al. 2017

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Methane hydrate‐bearing sediments with different amounts of fines content and at three densities were artificially prepared under controlled temperature and pressure conditions. The void ratios of specimens after isotropic consolidation tend to decrease with a rise in fines content. The fines particles enter into the pore space between sand grains and densify the specimens. A series of triaxial compression tests were performed to systematically investigate the influences of fines content and density on the shear properties of hydrate‐free sediments and methane hydrate‐bearing sediments. The test results demonstrate that a rise in fines content within methane hydrate‐bearing sediments significantly enhances peak shear strength and promotes dilation behavior. These influences are particularly prominent for specimens at loose packing state. A decrease in void ratio increases the shear strength and stiffness of hydrate‐free sediments and methane hydrate‐bearing sediments containing fines content of 0% and 8.9%. It is noted that the formation of methane hydrate in samples with varying amounts of fines content increases the stress ratios at the critical state. The addition of fines particles into coarse‐grained sand grains alters the internal microstructure of sand matrix and the hydrate formation pattern in the pore space between sand grains and fines particles.

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Section: Methodsmentioning

confidence: 99%

Influence of Fines Content on the Mechanical Behavior of Methane Hydrate‐Bearing Sediments

et al. 2017

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“…However, the time-dependent behaviors of methane-hydrate-bearing sediments have not been fully clarified, although they are thought to have great significance in predicting the long-term behaviors of sediment over a time scale of decades. Thus, few models consider the time-dependent behaviors of methane-hydrate-bearing sediments appropriately based on experimentally obtained properties [25][26][27], although many constitutive models for methane-hydrate-bearing sediments have been proposed in earlier works [10,11,[28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Relationship between Creep Property and Loading-Rate Dependence of Strength of Artificial Methane-Hydrate-Bearing Toyoura Sand under Triaxial Compression

2017

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Abstract:Methane hydrate is anticipated to be a promising energy resource. It is essential to consider the mechanical properties of a methane hydrate reservoir to ensure sustainable production, since its mechanical behavior may affect the integrity of the production well, the occurrence of geohazards, and gas productivity. In particular, the creep property of methane-hydrate-bearing sediment is thought to have great significance in the long-term prediction of the mechanical behaviors of a reservoir. In earlier studies, triaxial compression tests were conducted on artificial methane-hydrate-bearing Toyoura sand under three axial-loading conditions, i.e., constant-strain-rate test, constant-stress-rate test, and creep (constant-stress) test. In this paper, the time-dependent properties of the methane-hydrate-bearing Toyoura sand observed in these tests were quantitatively discussed and found to be almost in agreement. The creep life obtained from the creep tests had a reasonably strong correlation with the loading-rate dependencies of strength, obtained from the constant-strain-rate tests and constant-stress-rate tests based on a simple hypothesis. The findings are expected to be used to develop a constitutive model considering the time-dependent behaviors of hydrate-bearing soil in future studies, and to improve the reliability of long-term prediction of the geomechanical response to gas extraction from a reservoir.

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“…These sands have similar grain size distribution as that of the Toyoura sand and exhibited similar mechanical characteristics. The samples from these different hosts yielded similar shear strengths, but gave a wide range of volume strains as shown in Figure , which was calculated from the published test data of Miyazaki et al . Such divergence arose likely because each curve was from a different sample and the volume change was more sensitive to the small subtle details in the sample preparation than the shear strength.…”

Section: Modeling Methodologymentioning

confidence: 87%

“…A different evaluation was carried out in this study regarding implementation of the model into FLAC3D and on its performance with the computational framework. Strain‐controlled drained triaxial tests were carried out in modeling the laboratory tests conducted by Miyazaki . The host soils for these tests were Toyoura sands.…”

Section: Modeling Methodologymentioning

confidence: 99%

Geomechanical modeling of hydrate‐bearing sediments during dissociation under shear

Lin

Seol

Choi³

2017

Num Anal Meth Geomechanics

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Summary Methane hydrate‐bearing sediments exist throughout the world in continental margins and in Arctic permafrost. Hydrates are ice‐like compounds when dissociate due to temperature rise or reduction in fluid pressure, release gas. Because of the mechanical property changes caused by dissociation in which the loads supported by the hydrates are transferred to soil grains, these sediments may become unstable. To quantify the risk of ground instability triggered by dissociation, which may happen during operation to extract methane gas or from climate changes, a reliable predictive model is indispensable. Even though many models have been proposed, a detailed validation of the ability to model dissociation impact is still needed. This study investigated the adequacy of an spatially mobilized plane constitutive model and a modeling framework using laboratory‐induced dissociation tests under shear from literature. Using laboratory‐imposed temperature and pressure changes and the resulting hydrate saturation changes as input, this study was able to capture the geomechanical responses and determine the stability state of methane hydrate‐bearing sediments as observed. Copyright © 2017 John Wiley & Sons, Ltd.

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A Nonlinear Elastic Model for Triaxial Compressive Properties of Artificial Methane-Hydrate-Bearing Sediment Samples

Cited by 112 publications

References 11 publications

Influence of Fines Content on the Mechanical Behavior of Methane Hydrate‐Bearing Sediments

Influence of Fines Content on the Mechanical Behavior of Methane Hydrate‐Bearing Sediments

Relationship between Creep Property and Loading-Rate Dependence of Strength of Artificial Methane-Hydrate-Bearing Toyoura Sand under Triaxial Compression

Geomechanical modeling of hydrate‐bearing sediments during dissociation under shear

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