Proceedings of the Korean Geotechical Society Conference (한국지반공학회:학술대회논문집)

Korean Geotechnical Society (한국지반공학회)
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GEOPHYSICAL CHARACTERIZATION OF MARINE CLAYS - FROM GEOTECHNICAL PARAMETER ESTIMATION TO PROCESS MONITORING -

  • Choi, Gye-Chun (Dept. of Civil and Environ. Engrg., Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Chang, Il-Han (Dept. of Civil and Environ. Engrg., Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Oh, Tae-Min (Dept. of Civil and Environ. Engrg., Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Kim, Hak-Sung (Dept. of Civil and Environ. Engrg., Korea Advanced Institute of Science and Technology (KAIST))
  • Published : 2010.09.09
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Abstract

Marine clays are soft soil deposits having complicated mineralogy and formation characteristics. Thus, characterization of its geotechnical behavior has been a main issue for geotechnical engineers. Nowadays, the importance and applications of geophysical exploration on marine clays are increasing significantly according to the accuracy, efficiency, and reliability of geophysical survey technology. For marine clays, seismic survey is effective for density and elasticity characterization, while electro-magnetic wave provides the information about the fluid conductivity phenomena inside soil. For practical applications, elastic wave technology can evaluate the consolidation state of natural marine clay layers and estimate important geotechnical engineering parameters of artificially reclaimed marine deposits. Electrical resistivity can provide geophysical characteristics such as particle cementation, pore geometry shape, and pore material phase condition. Furthermore, nondestructive geophysical monitoring is applicable for risk management and efficiency enhancement during natural methane gas extraction from gas hydrate-bearing sediments.

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