Influence particle size on strength of gas hydrate cemented granular materials
Quantifying the effect of gas hydrates on engineering properties of sediments is essential to assess its role as triggering mechanism for submarine slope instabilities, potential energy resource or accelerating climate change. Previous studies show cementation due to presence of gas hydrate in deep...
| Main Authors: | , |
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| Other Authors: | , , |
| Format: | Conference Object |
| Language: | English |
| Published: |
CRC Press
2016
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| Subjects: | |
| Online Access: | https://eprints.soton.ac.uk/400459/ https://eprints.soton.ac.uk/400459/1/Madhu_CRIC_ICEGT_2016.pdf |
| Summary: | Quantifying the effect of gas hydrates on engineering properties of sediments is essential to assess its role as triggering mechanism for submarine slope instabilities, potential energy resource or accelerating climate change. Previous studies show cementation due to presence of gas hydrate in deep ocean sediments or permafrost influences the seismic wave velocities of host sediment. This study examines the effect of particle size on the strengths of gas hydrate cemented granular materials using our recently developed gas hydrate triaxial apparatus. Cylindrical specimens of given porosity, methane hydrate content were prepared using ‘excess gas method’ and sheared undrained at constant effective stress and rate of shearing for sands. These tests were then compared with their corresponding host sediments with no hydrates. The stress strain behaviour indicates the host soils exhibits stiffer behaviour due to presence of hydrates similar to structured soils of sensitivity greater than 10. However, the change in strength behaviour of the disseminated gas hydrate sediments is significantly influenced by the particle size, in terms of their specific surface and grading of the granular material regardless of similarity in the hydrate concentration. |
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