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http://dx.doi.org/10.9711/KTAJ.2019.21.3.323

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

Kang, Daehun (School of Civil, Environmental and Architectural Engineering, Korea University)
Lee, In-Mo (School of Civil, Environmental and Architectural Engineering, Korea University)
Jung, Jee-Hee (School of Civil, Environmental and Architectural Engineering, Korea University)
Kim, Dohyung (School of Civil, Environmental and Architectural Engineering, Korea University)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.21, no.3, 2019 , pp. 323-345 More about this Journal
Abstract
It is essential to predict ground conditions ahead of a tunnel face in order to successfully excavate tunnels using a shield TBM. This study proposes a forward prediction method for a mixed soil ground and/or a ground containing core stones by using electrical resistivity and induced polarization exploration. Soil conditioning in EPB shield TBM is dependent upon the composition of mixed soils; a special care need to be taken when excavating the core-stoned soil ground using TBM. The resistivity and chargeability are assumed to be measured with four electrodes at the tunnel face, whenever the excavation is stopped to assemble one ring of a segment lining. Firstly, the mixed ground consisting of weathered granite soil, sand, and clay was modeled in laboratory-scale experiments. Experimental results show that the measured electrical resistivity considerably coincides with the analytical solution. On the other hand, the induced polarization has either same or opposite trend with the measured resistivity depending on the mixed ground conditions. Based on these experimental results, a method to predict the mixed soil ground that can be used during TBM tunnel driving is suggested. Secondly, tunnel excavation from a homogeneous ground to a ground containing core stones was modeled in laboratory scale; the irregularity of the core stones contained in the soil layer was modeled through random number generation scheme. Experimental results show that as the TBM approaches the ground that contains core stones, the electrical resistivity increases and the induced polarization fluctuates.
Keywords
Soil ground; Core-stoned ground; Forward probing; Electrical resistivity; Induced polarization;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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