DOI QR코드

DOI QR Code

Electrical resistivity tomography survey for prediction of anomaly in mechanized tunneling

  • Lee, Kang-Hyun (Research Institute, Korea Expressway Corporation) ;
  • Park, Jin-Ho (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Park, Jeongjun (Korea Railroad Research Institute) ;
  • Lee, In-Mo (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Lee, Seok-Won (Department of Civil and Environmental Engineering, Konkuk University)
  • 투고 : 2018.02.22
  • 심사 : 2019.09.10
  • 발행 : 2019.09.20

초록

Anomalies and/or fractured grounds not detected by the surface geophysical and geological survey performed during design stage may cause significant problems during tunnel excavation. Many studies on prediction methods of the ground condition ahead of the tunnel face have been conducted and applied in tunneling construction sites, such as tunnel seismic profiling and probe drilling. However, most such applications have focused on the drill and blast tunneling method. Few studies have been conducted for mechanized tunneling because of the limitation in the available space to perform prediction tests. This study aims to predict the ground condition ahead of the tunnel face in TBM tunneling by using an electrical resistivity tomography survey. It compared the characteristics of each electrode array and performed an investigation on in-situ tunnel boring machine TBM construction site environments. Numerical simulations for each electrode array were performed, to determine the proper electrode array to predict anomalies ahead of the tunnel face. The results showed that the modified dipole-dipole array is, compared to other arrays, the best for predicting the location and condition of an anomaly. As the borehole becomes longer, the measured data increase accordingly. Therefore, longer boreholes allow a more accurate prediction of the location and status of anomalies and complex grounds.

키워드

과제정보

연구 과제번호 : Development of Key Subsea Tunnelling Technology

연구 과제 주관 기관 : Ministry of Land, Infrastructure, and Transport of the Korean government

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