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Tunnel Pre-investigation - Towards a Resistivity to Rock-quality Transform
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Near Surface Geoscience 2014 - 20th European Meeting of Environmental and Engineering Geophysics, Sep 2014, Volume 2014, p.1 - 5
Abstract
Summary
The aim of our study is to assess whether resistivity may be transformable into an engineering parameter such as the Q-value and can substitute seismic investigation when not practicable. ERT has the advantage of being efficient, reliable, silent and non-destructive, therefore suitable in urban areas.
We have integrated Q-values derived from core drillings and geological logging during tunnelling and resistivity derived from surface ERT on two tunnel projects in Norway. In both cases, it is qualitatively evident that lower resistivity points towards weaker rock. Indeed, preliminary results can partially show the expected correlation where resistivity data co-align with boreholes or the tunnel.
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