ELECTRICAL RESISTIVITY MEASUREMENT FOR COUNTRY ROCK DISTURBANCE OF SHALLOW RAILWAY TUNNEL

9th International Multidisciplinary Scientific GeoConference - SGEM2009, www.sgem.org, SGEM2009 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 14-19, 2009, Vol. 1, 405-412 pp

ABSTRACT

The roof of the tunnel and sidewalls are especially influenced by the tunnels shape and
dimension. Rock engineering mostly concentrates the reasons of these disturbances to
decide if they are stress induced or discontinuity governing deformations. In this study,
it has been concentrated on two shallow tunnels which are 35-90 meters below the
ground surface. They were opened in limestone rock mass containing lamination and
cavities as well. Electrical resistivity measurements were used to determine the
weakness zones around these tunnels. Extension of the weakness zone demonstrated
that the disturbance around the tunnels were rock mass controlled instate of stress
induced fracturing.

Keywords: Electrical earth resistivity, shallow tunnel, disturbance zone.