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

Korean Geotechnical Society (한국지반공학회)
권호 표지

Detection of thin-layered soil using CRPT in soft soil

CRPT를 이용한 연약지반 협재층 탐지

  • Yoon, Hyung-Koo (Department of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Kim, Joon-Han (Department of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Kim, Rae-Hyun (Department of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Choi, Yong-Kyu (Department of Civil Engineering, Kyungsung University) ;
  • Lee, Jong-Sub (Department of Civil, Environmental and Architectural Engineering, Korea University)
  • 윤형구 (고려대학교 건축.사회환경공학과) ;
  • 김준한 (고려대학교 건축.사회환경공학과) ;
  • 김래현 (고려대학교 건축.사회환경공학과) ;
  • 최용규 (경성대학교 토목공학과) ;
  • 이종섭 (고려대학교 건축.사회환경공학과)
  • Published : 2008.10.10
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Abstract

The detection of thin-layered soil is important in soft soils to evaluate the soil behavior. The smaller diameter cone penetrometer have been commonly used to detect the layer with increasing sensitivity. The objective of this study is to detect the thin-layered soil using cone resistance and electrical resistance. The cone resistivity penetration test (CRPT) is developed to evaluate the cone tip resistance and electrical resistance at the tip. The CRPT is a micro-cone which has a $0.78cm^2$ in projected area. The application test is conducted in a laboratory large-scale consolidometer (calibration chamber). The kaolinite, sand and water are mixed to make the specimen at the liquid limit of 46% using a slurry mixer. It takes two months for the consolidation of the specimen. After consolidation, the CRPT test is carried out. Furthermore the standard CPT results are compared with the electrical resistance measured at the tip in the field. This study suggests that the CRPT may be a useful tool for detecting thin-layers in soft soils.

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