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http://dx.doi.org/10.9711/KTAJ.2018.20.1.055

Forward probing utilizing electrical resistivity and induced polarization for predicting mixed-ground ahead of TBM tunnel face  

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)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.20, no.1, 2018 , pp. 55-72 More about this Journal
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.
Keywords
Mixed-ground; Forward probing; Electrical resistivity; Induced polarization; TBM;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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