Applicability of Resistivity/Capacitance Measurement on CPT Module for Investigation of Subsurface Contamination

오염지반 조사를 위한 전기비저항/정전용량 측정콘의 적용성 평가

  • Oh, Myoung-Hak (Dept. of Civil, Urban & Geosystem Engineering, Seoul National University) ;
  • Kim, Yong-Sung (Dept. of Civil, Urban & Geosystem Engineering, Seoul National University) ;
  • Yoo, Dong-Ju (Dept. of Civil, Urban & Geosystem Engineering, Seoul National University) ;
  • Park, Jun-Boum (Dept. of Civil, Urban & Geosystem Engineering, Seoul National University)
  • 오명학 (서울대학교 지구환경시스템공학부) ;
  • 김용성 (서울대학교 지구환경시스템공학부) ;
  • 유동주 (서울대학교 지구환경시스템공학부) ;
  • 박준범 (서울대학교 지구환경시스템공학부)
  • Published : 2006.03.24

Abstract

Resistivity cone penetrometer test (RCPT) can be employed at a relatively low cost for delineation of subsurface contamination in situ, and then be supplemented with a minimum confirmatory sampling and laboratory testing program. While the resistivity measurement have potential to investigate the subsurface contamination, resistivity measurements alone will lead to some degree of ambiguity in the results. In this study, capacitance measurement was incorporated into the RCPT to overcome the ambiguity inherent in electrical resistivity measurements for delineating the subsurface contamination. This study is focused on verifying the applicability of resistivity and capacitance measurements on CPT module to provide information on contaminated subsurface by heavy metal and petroleum hydrocarbon. Laboratory model tests were performed to evaluate the sensitivity of the measured resistivity and relative capacitance on the water content and different types of contaminants. Test results show that simultaneous measurement of electrical resistivity and capacitance can give more reliable information on subsurface contamination.

Keywords