DBPapers

GEODETIC WORKS ON THE BREAKTHROUGH OF THE TUNNEL THROUGH BIOKOVO

AUTHOR/S: L. REDOVNIKOVIC, Z. KAPOVIC, M. DZAPO
Sunday 1 August 2010 by Libadmin2010

10th International Multidisciplinary Scientific GeoConference - SGEM2010, www.sgem.org, SGEM2010 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 20-26, 2010, Vol. 1, 869-876 pp

ABSTRACT

Tunnel ’’St. Ilija’’ is on the road that connects the Makarska Riviera and a new highway
through the mountain range Biokovo (Figure 1). With a length of 4250 m, it is currently
fourth road tunnel in Croatia, but also the tunnel with greatest overburden of 1300 m.
According to the available information this is a road tunnel with the biggest limestone
overburden in Europe, and as such it represented a real challenge for all who
participated in its construction. This article describes the geodetic works that are
undertaken in order to control breakthrough of the tunnel ’’St. Ilija’’. Activities are given
in chronological order, from the preparation activities, control of external
micronetworks using - GPS static methods, their connecting with precision traverse and
underground geodetic control to the very breakthrough. Used instruments and software
are showed, and appropriate methods of measurement are explained. The paper will
also be speaking about the problems that can happen in the tunnel breakthrough with
such high overburden, particularly the effect of lateral refraction.

Keywords: tunnel, breakthrough, lateral refraction, surveying