Journal of Korean Tunnelling and Underground Space Association (한국터널지하공간학회 논문집)

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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Forward probing utilizing electrical resistivity and induced polarization for predicting mixed-ground ahead of TBM tunnel face

전기비저항과 유도분극을 활용한 TBM 터널 굴착면 전방 복합지반 예측 기법

  • Ryu, Jinwoo (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Park, Jinho (Department of Civil and Environmental Engineering, University of California) ;
  • Lee, Seong-Won (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Lee, In-Mo (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Kim, Byung-Kyu (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 류진우 (고려대학교 건축사회환경공학부) ;
  • 박진호 (UC버클리) ;
  • 이성원 (한국건설기술연구원 지반연구소) ;
  • 이인모 (고려대학교 건축사회환경공학부) ;
  • 김병규 (고려대학교 건축사회환경공학부)
  • Received : 2017.11.27
  • Accepted : 2018.01.03
  • Published : 2018.01.31
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Abstract

A method that can predict the mixed-ground condition ahead of a TBM tunnel face during tunnel construction utilizing electrical resistivity and induced polarization (IP) was proposed in this study. Effect of TBM advancement approaching the mixed-ground condition (composed of soil layer overlying rock layer) when currently running through soil zone on the electrical resistivity and IP measuring was assessed with laboratory-scale experiments. The resistivity and IP values were measured using four electrodes, by installing two electrodes on the tunnel face (at the cutterhead), and the other two electrodes on the segment lining. The test results showed that both of the measured resistivity and IP values were kept increasing as the TBM is approaching the soil-rock mixed-ground. Also, to get the more reliable results for predicting the mixed-ground condition, it was recommended that the measurement is made at the tunnel face utilizing 4-electrodes installed at the cutterhead as well as it is made utilizing the 2-electrodes installed at the segment lining along with the 2-electrodes installed on the tunnel face (at the cutterhead) so that two measured results are compared each other.

본 연구에서는 시공 중 TBM 터널에서 전기비저항과 유도분극(induced polarization, IP) 탐사를 활용하여 굴착면 전방의 복합지반(mixed-ground)을 예측하기 위한 방안을 제시하였다. TBM이 토사를 굴진하며, 굴착면 전방에서 상부 토사지반과 하부 암반으로 이루어진 복합지반을 조우하는 과정과 동시에 전기비저항과 유도분극에 의한 충전성(chargeability)을 측정하며 굴진하는 과정을 실내실험으로 모사하였다. 전기비저항과 충전성의 측정은 4전극을 이용하였으며, 복합지반을 효과적으로 예측하기 위하여 2개의 전극은 굴착면에, 나머지 2개의 전극은 조립된 세그먼트에 설치됨을 가정하였다. 실험 결과, TBM이 토사 굴진 중 토사-암반의 복합지반으로 진입할 경우 전기비저항과 충전성이 모두 증가하였다. 또한, TBM이 굴착면 전방에서 복합지반을 조우할 것임을 예측하기 위하여 굴착면의 전극 2개, 세그먼트의 전극 2개를 활용한 탐사와 동시에 굴착면 4전극 탐사를 수행하면 더욱 효과적인 예측이 가능함을 확인하였다.

Keywords

References

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