Experimental study on mechanical properties of gas hydrate-bearing sediments using kaolin clay |
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Authors: | Yang-hui Li Yong-chen Song Feng Yu Wei-guo Liu Jia-fei Zhao |
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Affiliation: | (1) Department of Earthquake Engineering, Bogazici University, Istanbul, Turkey;(2) Department of Civil Engineering, University of Gaziantep, Gaziantep, Turkey;(3) Department of Civil Engineering, Bogazici University, Istanbul, Turkey; |
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Abstract: | A triaxial system is designed with a temperature range from −20 °C to 25 °C and a pressure range from 0 MPa to 30 MPa in order to improve the understanding of the mechanical properties of gas hydrate-bearing sediments. The mechanical properties of synthetic gas hydrate-bearing sediments (gas hydrate-kaolin clay mixture) were measured by using current experimental apparatus. The results indicate that: (1) the failure strength of gas hydrate-bearing sediments strongly depends on the temperature. The sediment’s strength increases with the decreases of temperature. (2) The maximum deviator stress increases linearly with the confining pressure at a low-pressure stage. However, it fluctuates at a high-pressure stage. (3) Maximum deviator stress increases with increasing strain rate, whereas the strain-stress curve has no tremendous change until the axial strain reaches approximately 0.5%. (4) The internal friction angles of gas hydrate-bearing sediments are not sensitive to kaolin volume ratio. The cohesion shows a high kaolin volume ratio dependency. |
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Keywords: | gas hydrate mechanical properties marine sediment triaxial testing safe extraction |
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