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http://dx.doi.org/10.7843/kgs.2009.25.6.17

Geotechnical Engineering Characteristics of Ulleung Basin Sediment, East Sea  

Lee, Chang-Ho (School of Civil and Environmental Engrg., Georgia Institute of Technology)
Yun, Tae-Sup (Department of Civil and Environmental Engrg., Lehigh Univ.)
J.C., Santamarina (School of Civil and Environmental Engrg, Georgia Institute of Technology)
Bahk, Jang-Jun (Petroleum and Marine Resources Division, Korea Institute of Geoscience and Mineral Resources)
Lee, Jong-Sub (School of Civil, Environmental, and Architectural Engrg., Korea Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.25, no.6, 2009 , pp. 17-29 More about this Journal
Abstract
There has been an increase in the investigation of deep sea sediments with a consequent increase in the amount of energy required to undertake these investigations. The geotechnical characteristics of Ulleung Basin sediment are explored by using depressurized specimens following methane production tests carried out on pressured core samples obtained at 2,100 m water depth and 110 m below sea floor. Geotechnical index tests, X-ray diffraction, and scanning electron microscope are conducted to identify the geotechnical index parameters, clay mineralogy, chemical composition, and microstructure of the sediments. Compressibility, and elastic and electromagnetic wave parameters are investigated for two samples by using a multi sensing instrumented oedometer cell. The strength chatracteristics are obtained by the direct shear tests. The dominant clay minerals are mostly kaolinite, illite, chlorite, and calcite. The SEM shows a well-developed flocculated structure of the microfossil. Void ratio, electrical resistivity, real permittivity, conductivity, and shear wave velocity show bi-linear behavior with the effective vertical stress: as the vertical effective stress increases. The friction angle obtained by the direct shear test is about $21^{\circ}$, which is similar to the value observed in the Ulleung Basin sediments. This study shows that the understanding of the behavior acting on the diatomaceous marine sediment is important because it often maintains the useful energy resources such as gas hydrate and so will be the new engineering field in the next generation.
Keywords
Atterberg limit; Compressibility; Conductivity; Deep marine sediment; Microfossil; Microstructure; Mineralogy; Permittivity; Shear wave;
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Times Cited By KSCI : 1  (Citation Analysis)
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