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http://dx.doi.org/10.9711/KTAJ.2015.17.3.383

Utilization of induced polarization for predicting ground condition ahead of tunnel face in subsea tunnelling: laboratory test  

Park, Jinho (School of Civil, Environmental and Architectural Engineering, Korea University)
Lee, Kang-Hyun (Korea Expressway Corporation Research Institute, Disaster & Safety Research Division)
Lee, Seong-Won (SOC Research Institute, Korea Institute of Construction Technology)
Ryu, Young-Moo (School of Civil, Environmental and Architectural Engineering, Korea University)
Lee, In-Mo (School of Civil, Environmental and Architectural Engineering, Korea University)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.17, no.3, 2015 , pp. 383-392 More about this Journal
Abstract
In subsea tunnelling, prediction of the fractured zone (or water bearing zone) ahead of tunnel face saturated by seawater with high water pressure has been a key factor for safe construction. This study verified the feasibility of utilizing induced polarization (IP) survey at tunnel face for predicting the ground condition ahead of the subsea tunnel face. A pore model was proposed to compute chargeability in granular material, and the relationship correlating chargeability with the variables affecting the chargeability was derived from the model. Parametric study has been performed on the variables to figure out the most influential factors affecting the chargeability. The results of the parametric study show that the size of narrow pores ($r_1$) and the salinity of pore water are the most influential factors on chargeability. Laboratory tests were conducted on various types of ground condition by changing the salinity of pore water, the thickness of the fracture zone and the existence of gouge (weathered granite) within the joints of the fractured zone to figure out the effect of the ground characteristics on the IP phenomenon. Test results show that the chargeability of the fractured zone saturated by seawater increases if the joints in the fractured zone are filled with gouge since the infilled gouge will decrease the size of narrow pores ($r_1$).
Keywords
Subsea tunnel; Induced polarization; Chargeability; Tunnel face; Fractured zone;
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Times Cited By KSCI : 1  (Citation Analysis)
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