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

한국지반공학회 (Korean Geotechnical Society)
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해안연약 지반 조사를 위한 4전극 전기비저항 프로브

4 Electrical Resistivity Probe for Investigating soft offshore soils

  • 김준한 (고려대학교 건축.사회환경공학부) ;
  • 윤형구 (고려대학교 건축.사회환경공학부) ;
  • 배명호 (고려대학교 건축.사회환경공학부) ;
  • 정순혁 (고려대학교 건축.사회환경공학부) ;
  • 이종섭 (고려대학교 건축.사회환경공학부)
  • Kim, Joon-Han (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Yoon, Hyung-Koo (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Bae, Myeong-Ho (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Jung, Soon-Hyuck (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Lee, Jong-Sub (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 발행 : 2009.03.27
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초록

Electrical resistivity can be used for porosity estimation. In order to improve previously developed ERCP(Electrical Resistivity Cone Probe), 4ERP(4 Electrical Resistivity Probe), which has Wenner array at the tip of probes, has been developed. In properties of current flow Wenner array measures electrical properties of undisturbed area during penetration and relatively correct measurements are guaranteed without polarization. Furthermore, Wenner array equation can estimate electrical resistivity without extra calibration. 4ERP is developed into 2 types, penetration and fixation. Penetration type has wedge-shaped tip. Considering disturbance minimization, fixed type has plane tip. Fixed type 4ERP in consolidation cell measure electrical resistivity increment along porosity decrease, and penetration type 4ERP measured resistivity profile along the depth in chamber. Applying Archie's law, porosity profile was estimated with electrical resistivity. The tests result suggests that 4ERP can be new site investigation equipment with little disturbance.

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