Geomechanical property evolution of hydrate-bearing sediments under dynamic loads: Nonlinear behaviors of modulus and damping ratio

Liu, Zhichao; Kim, Jongchan; Hu, Gaowei; Hu, Wei; Ning, Fulong

doi:10.1016/j.enggeo.2021.106427

Cited by 22 publications

(8 citation statements)

References 60 publications

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“…Liu et al systematically analyzed the Poisson ratio versus hydrate saturation and did not find an explicit influence tendency of hydrate occurring on Poisson’s ratio obtained from the triaxial compression tests. For simplicity, Poisson’s ratio is assumed to be independent of hydrate saturation herein.…”

Section: Model Formulationmentioning

confidence: 99%

“…Based on the elasticity theory, increments in elastic volumetric and deviatoric strains can be calculated as where μ is Poisson's ratio of MHBS, κ is the slope of the unloading−reloading line within the v In p′ plot, p′ is the mean effective stress, q is the deviatoric stress, and e 0 is the initial void ratio. Liu et al 47 systematically analyzed the Poisson ratio versus hydrate saturation and did not find an explicit influence tendency of hydrate occurring on Poisson's ratio obtained from the triaxial compression tests. For simplicity, Poisson's ratio is assumed to be independent of hydrate saturation herein.…”

Section: Phase State Parameter θmentioning

confidence: 99%

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Modeling the Mechanical Behavior of Methane Hydrate-Bearing Soil Considering the Influences of Temperature and Pore Pressure

Yan

Song

et al. 2022

Energy Fuels

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Temperature and pore pressure have a significant impact on the mechanical behavior of methane hydrate-bearing soil (MHBS). To characterize the mechanical responses of MHBS under different temperatures and pore pressures, an elastoplastic constitutive model is developed within the framework of the critical-state theory. In the proposed model, an additional variable, called the phase state parameter, is introduced to characterize the temperature and pore pressure condition. Meanwhile, the elastic parameter, plastic modulus, and tensile bonding stress are related to the phase state parameter through several empirical formulas. As a consequence, the influences of temperature and pore pressure on the stiffness, strength, and dilatancy of MHBS are addressed by the proposed constitutive model. Through comparing the predicted results and experimental data, the proposed model is demonstrated to have the ability to capture the influences of hydrate saturation, temperature, and pore pressure on the mechanical behavior of MHBS. In addition, the proposed model is used to analyze the response of MHBS to an increase in temperature or a decrease in pore pressure within the hydrate stability boundary. The result shows that the proposed model can reasonably reflect the mechanical behavior of MHBS induced by heating or depressurization procedures within the hydrate stability boundary.

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Section: Model Formulationmentioning

confidence: 99%

Section: Phase State Parameter θmentioning

confidence: 99%

Modeling the Mechanical Behavior of Methane Hydrate-Bearing Soil Considering the Influences of Temperature and Pore Pressure

Yan

Song

et al. 2022

Energy Fuels

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“…More experimental details can refer to our previous studies. 30,31 Figure 2 shows a diagram of the two driving modes. In the torsional mode, the four coils were simultaneously supplied with synchronous currents to make the four magnets rotate horizontally in the same direction, thereby forming a horizontal rotating moment on the top of the specimen to produce torsional shearing motion.…”

Section: Experimental Apparatus and Specimen Preparationmentioning

confidence: 99%

“…Zhu et al 29 studied the dynamic strength characteristics of methane HBS under seismic load, and conducted a series of dynamic triaxial tests on artificial methane hydrate-bearing sediments under various confining pressures between 0.5 and 2.1 MPa. Liu et al 30,31 used a customized hydrate resonant column to test the HBS at different hydrate saturations and identified the relationship between wave velocity, hydrate saturation, and confining pressure.…”

Section: Introductionmentioning

confidence: 99%

The effect of particle size and hydrate status on dynamic mechanical properties of hydrate‐bearing sediments

Ning

Liu

et al. 2021

Energy Science & Engineering

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Dynamic mechanical properties of natural gas hydrate (NGH) reservoirs are extremely important owing to their critical role in drilling safety and reservoir stability during NGH development. However, the comprehensive influence of reservoir skeleton and hydrate status on the dynamic mechanical properties of hydrate-bearing sediments (HBS) has rarely been reported. In this study, three types of sandy sediments with different particle size were simulated. A customized resonant column system was used to synthesize HBS and to test the dynamic mechanical properties of the HBS under the conditions of different confining pressures and shear strains. In addition, the dynamic mechanical responses of the hydrate-free and hydrate-dissociated specimens were comprehensively studied to further demonstrate the dominant role of hydrate status and skeleton-hydrate interactions on the dynamic mechanical properties of HBS. The results show that the shear moduli of the HBS specimens increase exponentially with an increase in confining pressure and decrease in amplitude strain. However, the damping ratios decreases with an increase in confining pressure and decrease in amplitude strain. With an increase in the median particle size (D 50 ) of the simulated sediments, the shear moduli tend to increase, whereas the damping ratios decreas.In addition, the hydrate occurrence decreases differences in moduli between fine-, medium-and coarse-skeleton specimens, and the enhancement effect of hydrate on the mechanical properties of the specimen is the maximum for the fine sediment specimens. Interestingly, we find that the modulus of the hydratedissociated specimen is relatively smaller than that of the hydrate-free specimen, which implies that the structure of the sediments could be rearranged and weakened due to the hydrate formation-dissociation processes.

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“…For testing the above deformation section, many devices have been constructed. The bender elements and resonance column test devices have been used to test the elastic deformation in hydrate reservoirs [27,28]. In addition, the triaxial and direct shear test techniques are mainly used in measuring the elastic-plastic deformation behavior of HBS [29,30].…”

Section: Introductionmentioning

confidence: 99%

Review on the Test Methods and Devices for Mechanical Properties of Hydrate-Bearing Sediments

Chen

Merey

et al. 2022

Sustainability

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Commercial exploitation of marine natural gas hydrate (NGH) is crucial for energy decarbonization. However, hydrate production would weaken reservoir mechanical properties and trigger geohazards. Experimental instruments are the basis to obtain the mechanical responses of hydrate-bearing sediments (HBS). Considering the reservoir deformation processes from elastic deformation to residual deformation during hydrate exploitation, this study comprehensively reviewed the feasibility and mechanical research progress of the bender element, resonance column, atomic force microscope, triaxial shear, direct shear, ring shear, and static penetration in mechanical testing. Each test method’s precision and sample size were comprehensively compared and analyzed. Finally, the limitations and challenges of the current mechanical testing methods for HBS were discussed, and their future development directions were proposed. The proposed development direction in mechanical testing methods is expected to provide insightful guidance for the development of instruments and improve the understanding of the mechanical behavior of HBS.

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Geomechanical property evolution of hydrate-bearing sediments under dynamic loads: Nonlinear behaviors of modulus and damping ratio

Cited by 22 publications

References 60 publications

Modeling the Mechanical Behavior of Methane Hydrate-Bearing Soil Considering the Influences of Temperature and Pore Pressure

Modeling the Mechanical Behavior of Methane Hydrate-Bearing Soil Considering the Influences of Temperature and Pore Pressure

The effect of particle size and hydrate status on dynamic mechanical properties of hydrate‐bearing sediments

Review on the Test Methods and Devices for Mechanical Properties of Hydrate-Bearing Sediments

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