Effect of Confining Pressure on Mechanical Properties of Sediment Containing Synthetic Methane Hydrate

Miyazaki, Kuniyuki; Yamaguchi, Tsutomu; Sakamoto, Yasuhide; Tenma, Norio; Ogata, Yoichi; Aoki, Katsumi

doi:10.2473/journalofmmij.126.408

Cited by 34 publications

(25 citation statements)

References 7 publications

(1 reference statement)

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“…The strengthening of hydrate-bearing sediments is mainly due to cohesion, which is defined by the MohreCoulomb failure criterion. In previous studies using Toyoura sand that contained synthetic MH, cohesion appeared to increase with increasing MH saturation, while the internal friction angle did not vary significantly with MH saturation (Masui et al, 2007;Miyazaki et al, 2010). The failure envelope is expressed in the following equation on the basis of the MohreCoulomb failure criterion, which assumes a constant friction angle even when the hydrate saturation is increased, and also assumes that hydrates only affect cohesion:…”

Section: Effect Of Hydrate Saturation and Confining Pressurementioning

confidence: 99%

“…Miyazaki et al (2010) presented the following empirical equations, showing that the increase in cohesion c follows an exponential function with hydrate saturation:…”

Section: Effect Of Hydrate Saturation and Confining Pressurementioning

confidence: 99%

“…The strength of hydrate-bearing sediments is based on the hydrate-free strength. Miyazaki et al (2010) conducted consolidated drained tests, and Hyodo et al (2013) conducted hydrate dissociation tests using synthetic hydrate-bearing sediments. They reported that the strength of the hydrate-bearing sands is based on the strength of the host sands.…”

Section: Effect Of Hydrate Saturation and Confining Pressurementioning

confidence: 99%

See 2 more Smart Citations

Mechanical properties of hydrate-bearing turbidite reservoir in the first gas production test site of the Eastern Nankai Trough

Yoneda

Masui

Konno³

et al. 2015

Marine and Petroleum Geology

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226

114

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Section: Effect Of Hydrate Saturation and Confining Pressurementioning

confidence: 99%

“…Miyazaki et al (2010) presented the following empirical equations, showing that the increase in cohesion c follows an exponential function with hydrate saturation:…”

Section: Effect Of Hydrate Saturation and Confining Pressurementioning

confidence: 99%

Section: Effect Of Hydrate Saturation and Confining Pressurementioning

confidence: 99%

See 1 more Smart Citation

Mechanical properties of hydrate-bearing turbidite reservoir in the first gas production test site of the Eastern Nankai Trough

Yoneda

Masui

Konno³

et al. 2015

Marine and Petroleum Geology

Self Cite

226

114

View full text Add to dashboard Cite

“…Likewise, [Miyazaki et al, 2007] has demonstrated that MH-bearing sand has a loading rate dependency, performing consolidated drained compression tests at various strain rates. Furthermore, it has become apparent that an increase in MH in specimens of Toyoura sand leads to an increase in strength [Miyazaki et al, 2010[Miyazaki et al, , 2011. Therefore, it is commonly believed that MH has cement-like properties.…”

Section: Introductionmentioning

confidence: 99%

Plane strain compression behaviour and localization of deformation of MH-bearing sand

Kato

Nakata

2016

JGS Special Publication

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As a result of recent investigations, carried out mainly by the MH21 research consortium of Japan, methane hydrate, referred to hereafter as ''MH'', is expected to become a possible future energy resource. In order to evaluate the stability of the seabed during MH production, previous research on the mechanical properties of MH-bearing sand have been conducted under triaxial stress conditions. However, these were very specific conditions whereas several stress conditions are assumed to exist in the Nankai Trough where MH production is carried out. Therefore it is essential to consider these stress conditions in order to understand the changes in stress and deformation behavior of the seabed. In this study, we describe the effects on MH-bearing sand under plane strain conditions with changing confining pressure. The apparatus used for plane strain tests has both a confining plate and an observation window. Local deformation of MH-bearing sand is shown using photographs of specimens taken during shear tests.A marked increase in the stress ratio of the host sand (Toyoura sand) and MH-bearing sand was more apparent in the plane strain tests than in the triaxial tests. The stress ratio decreased dramatically after the appearance of the peak stress ratio. Moreover, the peak stress ratio of MH-bearing sand was higher than that of the host sand as shown in previous research. After shear, in the case of the host sand, particle crushing increased as the effective confining pressure increased. Additionally, more particle crushing occurred inside the shear band than outside. In the case of the host sand, the failure strength for plane strain tests shifted from the SMP criterion to the Mohr-Coulomb criterion as the effective confining pressure increased, due to particle crushing. In the case of MH-bearing sand, the failure strength for every effective confining pressure lay between the SMP criterion and Mohr-Coulomb criterion. Expansive volumetric dilation increased within the shear band as the axial strain increased for each case, with more dilation occurring for MH-bearing sand compared with host sand.

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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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Effect of Confining Pressure on Mechanical Properties of Sediment Containing Synthetic Methane Hydrate

Cited by 34 publications

References 7 publications

Mechanical properties of hydrate-bearing turbidite reservoir in the first gas production test site of the Eastern Nankai Trough

Mechanical properties of hydrate-bearing turbidite reservoir in the first gas production test site of the Eastern Nankai Trough

Plane strain compression behaviour and localization of deformation of MH-bearing sand

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

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