Geotechnical properties of deep oceanic sediments recovered from the hydrate occurrence regions in the Ulleung Basin, East Sea, offshore Korea |
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| Authors: | Tae-Hyuk Kwon Kang-Ryel Lee Gye-Chun Cho Joo Yong Lee |
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| Institution: | aEarth Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd. Berkeley, CA 94720, USA;bDepartment of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Republic of Korea;cKorea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon 305-350, Republic of Korea |
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| Abstract: | This study presents comprehensive geotechnical data of the natural marine sediments cored from the hydrate occurrence regions during the Ulleung Basin Gas Hydrate Expedition 1 (UBGH1), East Sea, offshore Korea in 2007. Geotechnical soil index properties of the Ulleung Basin sediments, including grain size distribution, porosity, water content, Atterberg limits, specific gravity, and specific surface area, were experimentally determined. These soil index properties were correlated to geotechnical engineering parameters (e.g., shear strength and friction angle) by using well-known empirical relationships. By performing standard consolidation tests on both undisturbed specimens (as recovered from the original core liner after hydrate dissociation) and remolded specimens, stress-dependent mechanical and hydraulic properties (e.g., compressibility and hydraulic conductivity) were measured. The experimental results provide important engineering parameters, and demonstrate the effect of hydrate presence and consequential dissociation to index properties, engineering parameters, and innate sediment structures. |
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| Keywords: | Gas hydrate Ulleung Basin Geotechnical property Permeability Mechanical property |
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