Shear strength and pore pressure characteristics of methane hydrate-bearing soil under undrained condition

Yan, Rongtao; Yu, Hongfei; Yang, Dehuan; Tang, Hao; Zhang, Qin

doi:10.1016/j.ijhydene.2022.12.038

Cited by 11 publications

(3 citation statements)

References 57 publications

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“…It was found that the stress–strain curve of HBS was strain-hardening during the shearing process and generated excess pore water pressures (Figure ). , Under undrained conditions, the pore volume of the specimen remains unchanged during the shear, and the water in pore space cannot be drained, making it difficult to change the hydrate distribution mode from pore-filling to load-bearing types. , Thus, undrained conditions limit the contribution of hydrate particles to the strength of HBS. For HBS specimens, the pore pressure increases with the increase of axial strain first, and gradually decreases after reaching the peak strength .…”

Section: Triaxial Shear Testmentioning

confidence: 99%

Mechanical Properties of Gas Hydrate-Bearing Sediments Influenced by Multiple Factors: A Comprehensive Review of Triaxial Tests

Zeng,

Kong,

Zhao

et al. 2023

Energy Fuels

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Natural gas hydrate (NGH) has the characteristics of low pollution and large reserves, which is considered as a very promising energy source. The extraction of NGH would cause the strength and stiffness reduced in hydrate-bearing sediment (HBS) reservoirs, which could lead to geological disasters. The mechanical properties of HBS have been studied by a large number of scholars, but it has not been sorted out and summarized for HBS under the influence of multiple factors. In this paper, the hydrate types, synthesis methods, and test conditions are summarized. The effects of hydrate saturation, loading rate, temperature, pore pressure, confining pressure, fine content, and clay content on mechanical properties and deformation behavior of HBS are outlined. The microstructure of the synthesis, decomposition, and shear processes of HBS specimens is also analyzed based on the CT triaxial shear test system, and the microscopic mechanism of HBS specimens in the shearing process is summarized. Finally, the shortcomings of current research on the mechanical properties of HBS are discussed, and provided corresponding suggestions to promote the development of the mechanical properties of HBS.

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Section: Triaxial Shear Testmentioning

confidence: 99%

Mechanical Properties of Gas Hydrate-Bearing Sediments Influenced by Multiple Factors: A Comprehensive Review of Triaxial Tests

Zeng,

Kong,

Zhao

et al. 2023

Energy Fuels

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“…This makes it very challenging to predict the undrained shear strength of hydrate-bearing fine-grained sediments. Several prediction models have been proposed based on the Mohr-Coulomb criterion [49,50], and the models can give acceptable results in certain circumstances.…”

Section: Introductionmentioning

confidence: 99%

Undrained Triaxial Shear Tests on Hydrate-Bearing Fine-Grained Sediments from the Shenhu Area of South China Sea

Wei

Liu

Jia

et al. 2023

JMSE

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Changes in undrained shear strength are important to the stability analysis of hydrate reservoirs during natural gas hydrate production. This study proposes a prediction model of undrained shear strength of hydrate-bearing fine-grained sediments based on the critical state theory. Several consolidated undrained triaxial shear tests are conducted on hydrate-bearing fine-grained samples from the Shenhu area of the South China Sea. The effects of effective consolidation stresses and hydrate saturations on the undrained shear strength are investigated. The results show that the undrained shear strength increases linearly with increasing effective consolidation stress. When the hydrate saturation is greater than the effective hydrate saturation, the undrained shear strength significantly increases with increasing hydrate saturation. The undrained shear strength of hydrate-bearing fine-grained sediments is a two-parameter function of effective hydrate saturation and a void ratio. The instability risk of the hydrate reservoir under undrained conditions is greater than that of under-drained or partially drained conditions. Furthermore, low-porosity reservoirs face more shear strength loss from hydrate decomposition yet lower risk than high-porosity ones. These results can improve the understanding of mechanical properties of hydrate-bearing fine-grained sediments under undrained conditions. This study also has implications for the design of marine structures in areas with hydrate-bearing sediment.

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“…The relationship between unfrozen water content and temperature is characterized by a freezing characteristic curve (SFCC). The unfrozen water in frozen soil is the channel for water migration, and its mechanical properties are also closely related to the content of unfrozen water [20][21][22]. Some scholars have pointed out that the migration of fine particles to the warm parts of the soil is caused by electrophoresis caused by frost (Bertouille, 1972 [23]).…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Effect of Salt Solution on the Soil Freezing Characteristic Curve for Expansive Soils

Yu,

Hao,

et al. 2023

Sustainability

Self Cite

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With the development of the Belt and Road Initiative in China, high-speed railways are booming and inevitably pass through seasonal frost regions. In Nanyang basin, due to seasonal changes, railway subgrades will undergo frost heaving and thawing subsidence. The freezing characteristics of the soil are characterized by the freezing characteristic curve, and the important factors affecting the freezing characteristic curve are the content of expansive clay minerals in the soil and the salt solution. Therefore, three soil samples with different montmorillonite contents were saturated with salt solutions of different concentrations, and the freezing temperature of the soil samples was controlled by a cold bath. After the temperature equilibrium, the frozen stable soil samples were put into a nuclear magnetic resonance instrument to test the unfrozen water content, and the relationship between the freezing temperature and the unfrozen water content of expansive soil under different salt solution concentrations was obtained. Additionally, a unified model was used to simulate the test results. The results show that SFCC shifts to the left, that is, the sodium chloride salt solution reduces the freezing point of the soil sample so that it has more unfrozen water at the same temperature. At the same time, the soil’s freezing characteristic curves are closely related to content of expansive clay minerals in the soil. The more expansive clay mineral content, the greater the corresponding unfrozen water content. These results provide some basic insights for improving the frost heave and thaw subsidence problems of railway subgrades in seasonal permafrost regions, which will have a positive impact on promoting the management and rational application of land resources and the promotion of sustainable development.

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Shear strength and pore pressure characteristics of methane hydrate-bearing soil under undrained condition

Cited by 11 publications

References 57 publications

Mechanical Properties of Gas Hydrate-Bearing Sediments Influenced by Multiple Factors: A Comprehensive Review of Triaxial Tests

Mechanical Properties of Gas Hydrate-Bearing Sediments Influenced by Multiple Factors: A Comprehensive Review of Triaxial Tests

Undrained Triaxial Shear Tests on Hydrate-Bearing Fine-Grained Sediments from the Shenhu Area of South China Sea

Experimental Investigation on the Effect of Salt Solution on the Soil Freezing Characteristic Curve for Expansive Soils

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