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Volume 35 Issue 8
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LIU Fang, KOU Xiao-yong, JIANG Ming-jing, XIONG Ju-hua, WU Xiao-feng. Triaxial shear strength of synthetic hydrate-bearing sediments[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(8): 1565-1572.
Citation: LIU Fang, KOU Xiao-yong, JIANG Ming-jing, XIONG Ju-hua, WU Xiao-feng. Triaxial shear strength of synthetic hydrate-bearing sediments[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(8): 1565-1572.
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Triaxial shear strength of synthetic hydrate-bearing sediments

  • 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin 541004, China; 4. Shanghai Tunnel Engineering Co., Ltd., Shanghai 200082, China

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  • Received Date: December 19, 2012
  • Published Date: August 19, 2013
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    • Abstract
  • Due to the scarcity of basic data of hydrate-bearing sediments, a series of triaxial tests are made on synthetic samples of methane-hydrate-bearing and tetrahydrofuran-hydrate-bearing sandy sediments, which are generated using the gas-filtration method and the pre-freezing method, respectively. Attention is focused on the bulk strength of the specimens at different levels of hydrate saturation. The contribution attributed to the back pressure is confirmed by use of the experimental data. The results indicate that the cohesion exponentially increases with the increase of the hydrate saturation. No significant variation is found in the internal frictional angle of the specimens with low to medium hydrate saturation (<50%), while the angle decreases with the increase of the hydrate saturation due to less particle interlocking at high saturation (>80%). In addition, the back pressure helps to strengthen the hydrate in voids and thus causes an increase in the strength of the hydrate-bearing specimens.
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