한국지반환경공학회 논문집 (Journal of the Korean GEO-environmental Society)

  • 제14권5호
  • /
  • Pages.33-39
  • /
  • 2013
  • /
  • 1598-0820(pISSN)
  • /
  • 2714-1233(eISSN)
한국지반환경공학회 (Korean Geo-Environmental Society)
권호 표지

동해 울릉분지 심해토의 지반공학적 특성(1) - 압밀 특성, 전단파 특성에 관한 연구

Geotechnical Characteristics of the Ulleung Basin Sediment, East Sea (1) - Cosolidation and Shear Waves Velocity

  • Kim, Youngmoon (Scool of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Lee, Jongsub (Scool of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Lee, Jooyong (Korea Institute of Geoscience and Mineral Resources) ;
  • Lee, Changho (Scool of Civil, Environmental and Architectural Engineering, Korea University)
  • 발행 : 2013.05.01
⟨ 이전 논문 다음 논문 ⟩

초록

전 세계적으로 새로운 에너지 자원을 개발하기 위해 심해 지역의 시추탐사를 진행하고 있다. 국내의 경우 2007년 동해 울릉분지에서 수행된 가스 하이드레이트 심부 시추 사업(Ulleung Basin Gas Hydrate Expedition 1)에서 가스 하이드레이트의 부존을 확인하였다. 가스 하이드레이트 생산 및 생산기지 건설을 위해 심해토의 지반공학적 특성은 매우 중요하다. 본 연구에서는 동해 울릉분지에서 수행된 가스 하이드레이트 심부 시추 사업(UBGH2)에서 획득된 시료를 이용하여 실내실험을 수행하고 지반공학적 특성을 분석하였다. 비중, 아터버그 한계, 비표면적 및 입도분석 등 기본 토질 특성 실험을 실시하고 선행연구의 결과와 비교하였다. 또한 벤더 엘리먼트를 설치한 압밀셀을 이용하여 압밀실험을 수행하면서 압밀특성을 분석하고 수직유효응력에 따른 전단파 속도를 측정하였고, 투수계수값을 구하였다.

A drilling exploration in deep sea is being processed to develop new energy resource in the world. In 2007, the presence of the gas hydrate had been confirmed during the UBGH1 (Ulleung Basin Gas Hydrate Expedition 1) in the Ulleung Basin. Geotechnical properties of the deep marine sediment are important factors for assessing the safety of gas production facility and productivity from the hydrate bearing sediment. In this study, comprehensive laboratory tests are conducted to investigate the geotechnical engineering characteristics of the deep marine sediments recovered from the hydrate occurrence regions during the UBGH2 (Ulleung Basin Gas Hydrate Expedition 2) in the Ulleung Basin, East Sea, Korea. The index properties of the specimens including the specific gravity, atterberg limits, specific surface, and particle size distribution are measured, and these are compared to the results reported by previous studies. A zero-lateral strain cell, which houses bender elements, is used to determine stress-dependant characteristics and shear wave velocities with the vertical effective stresses. Furthermore, the hydraulic conductivity is calculated based on the consolidation test results.

키워드

참고문헌

  1. Al-Khafaji, A. W. N. and Andersland, O. B.(1992), Equations for compression index approximation, Journal of Geotechnical Engineering, Vol. 118, No. 1, pp. 148-153. https://doi.org/10.1061/(ASCE)0733-9410(1992)118:1(148)
  2. Bahk, J. J., Chough, S. K., Han, S. J.(2000), Origins and paleoceanographic significance of laminated muds from the Ulleung Basin, East Sea (Sea of Japan). Marine Geology, Vol. 162, No. 2-4, pp. 459-477. https://doi.org/10.1016/S0025-3227(99)00079-1
  3. Bennett, N.(1976), Conversion of in situ measurements of conductivitytosalinity, Deep Sea Research and Oceanographic Abstracts, Vol. 23, No. 2, pp. 157-165. https://doi.org/10.1016/S0011-7471(76)80024-1
  4. Chough, S. K., Lee, S. H., Kim, J. W., Park, S. C., Yoo, D. G.., Han, H. S., Yoon, S. H., Oh, S. B., Kim, Y. B., Back, G.. G..(1997), Chirp (2-7 kHz) echo characters in the Ulleung Basin. Geosciences Journal, Vol. 1, No. 3, pp. 143-153. https://doi.org/10.1007/BF02910206
  5. Damuth, J. E.(1975), Echocharacter of the western equatorial Atlantic floor and its relationship to the dispersal and distribution of terrigenous sediments. Marine Geology, Vol. 18, No.2, pp. 17-45. https://doi.org/10.1016/0025-3227(75)90047-X
  6. Ginsburf, G. D., Soloviev, V. A., Cranston, R. E., Lorenson, T. D., Kvenvoldenm K. A.(1993), Gas Hydrates from the continental slope, offshore Sakhalin Island, Okhotsk Sea. Geo-Marine Letters, Vol. 13, No. 1, pp. 41-48. https://doi.org/10.1007/BF01204391
  7. Huh, S., Chun, J. H., Han, S. J., Yoo, H, S., Kim, S, R., Kim, H. J., Choi, D, L., Lee, Y. K.(1999), Distribution, Characteristics, and Depositional Environments of Gas-Charged Sediment in the Southeastern Ulleung Basin, the East Sea. Jounal of the Geological Society of Korea, Vol. 35, No. 3, pp. 201-212(in Korean).
  8. Kwon, T. H., Lee, K. R., Cho, G. C., Lee, J. Y.(2011), Geotechnical properties of deep sediments recovered from the hydrate occurrence regions in the Ulleung Basin, East Sea, offshore Korea. Marine and Petroleum Geology, Vol. 28, No. 10, pp. 1870-1883. https://doi.org/10.1016/j.marpetgeo.2011.02.003
  9. Lee, C., Yun, T. S., Lee, J. S., Bahk, J. J., Santamarina, J. C.(2011), Geotechnical characterization of marine sediments in the Ulleung Basin, East Sea. Engineering Geology, Vol. 117, No. 1-2, pp. 151-158. https://doi.org/10.1016/j.enggeo.2010.10.014
  10. Lee, H. J., Chun, S. S., Yoon, S. H., Kim, S. R.(1993), Slope stability and geotechnical properties of sediment of the southern margin of Ulleung Basin, East Sea (Sea of Japan). Marine Geology, Vol. 110, No. 1-2, pp. 31-45. https://doi.org/10.1016/0025-3227(93)90103-3
  11. Lee, J. S., Lee, C.(2006), Principles and Considerations of Bender Element Tests, Journal of the Korean Geoenvironmental Society, Vol. 22, No. 5, pp. 47-57(in Korean).
  12. Mitchell, J. K., Soga, K. (2005), Fundamentals of soil behavior. John Wiley and Sons. New Jersey. pp. 234-292.
  13. Nagaraj, T and Murty, B. S. R.(1985), Prediction of the preconsolidation pressure and recompression index of soils, Journal of Geotechnical Testing, Vol. 8, No. 4, pp. 199-202. https://doi.org/10.1520/GTJ10538J
  14. Park, M. H., Kim, J. H., Kil, Y. W.(2007), Identification of the late Quaternary tephra layers in the Ulleung Basin of the East Sea using geochemical and statistical methods. Marine Geology, Vol. 244, No. 1-4, pp. 196-208. https://doi.org/10.1016/j.margeo.2007.06.006
  15. Rendon-Herrero, O. (1983), Universal compression index. Journal of the Geotechnical Engineering Division, Vol. 106, No. 11, pp. 1179-1200.
  16. Sakai, H., Gamo, T., Ogawa, Y., Boulegue, J.(1992), Stable isotopic ratios and origins of the carbonates associated with cold seepage at the eastern Nankai Trough, Earth Planetary Science Letters, Vol. 109, No. 3-4, pp. 391-404. https://doi.org/10.1016/0012-821X(92)90101-Z
  17. Santamarina, J. C., Klein, K. A., Fam, M. A.(2001), Soils and Waves - Particulate Materials Behavior, Characterization and Process Monitoring, John Wiley and Sons, New York, pp. 254-261.
  18. Song, M. S.(1988), Correlation between Marine Clay and Coefficient of Soil in Korea, Md. dissertation, University of Hanyang, pp.1-79(in Korean).
  19. Waite, W.F., Santamarina, J.C., Cortes, D.D., Dugan, B., Espinoza, D.N., Germaine, J., Jang, J., Jung, J.W., Kneafsey, T.J., Shin, H., Soga, K., Winters, W.J., Yun, T.S. (2009), Physical properties of hydrate-bearing sediments. Rev. Geophys. Vol. 47, RG4003. doi:10.1029/2008RG000279.
  20. Yun, T. S., Fratta, D., Santamarina, J. C.(2010), Hydrate-Bearing Sediments from the Krishna-Godavari Basin: Physical Characterization, Pressure Core Testing, and Scaled Production Monitoring. Energy Fuels, Vol. 24, pp. 5972-5983. https://doi.org/10.1021/ef100821t
  21. Yun, T. S., Narsilio, G. A., Santamarina, J. C.(2006), Physical characterization of core samples recovered from Gulf of Mexico, Marine and Petroleum Geology, Vol. 23, No. 9-10, pp. 893-900. https://doi.org/10.1016/j.marpetgeo.2006.08.002