Due to Slovenia’s varied topography, there are a considerable number of tunnels on the national road motorway and rail network, all of which have to be regularly inspected. A considerable number of tunnels will also be built on the new Divača – Koper railway line. In the field of tunnel construction ZAG performs the following works:

  • Geological and geomechanical investigations,
  • Static and dynamic stability analyses,
  • External control of the quality of construction of tunnels,
  • External control of the quality of prestressed and passive geotechnical anchors,
  • Monitoring of tunnels during their construction and later exploitation,
  • Periodical and main inspections of tunnels.

External control of the following tunnels:
The Karavanke motorway tunnel – repair works, the Karavanke railway tunnel – repair works, and the Golovec, V Zideh, Trojane, Podmilj, Jasovnik, Kastelec, Dekani, Barnica, Tabor, Šentvid, Leščevje, and Cenkova motorway tunnels, and the Markovec tunnel

DARS 1998 – 2014

Study of the possibilities of construction of underground structures in Slovenia (2000-2002)

ARAO 2000 – 2002

Study of the possibilities of the underground excavation of natural stone in Slovenia

ARAO 1998 – 2005

Repair of several sections of the Karavanke motorway tunnel

DARS 1998 – 2014

Geological-geotechnical investigations for the design of motorway tunnels in Slovenia: the Karavanke, Debeli Hrib, Mali Vrh, Golovec, Trojane, Pletovarje, Golo Rebro, Šentvid and Tabor motorway tunnels

DARS 1990 – 2013

Consultation, measurements and cooperation in the geological and geotechnical monitoring of all motorway tunnels in Slovenia

DARS 1996 – 2013

Characterization of rocks in connection with the construction of a railway tunnel through the Karst

DARS 2009 – 2011

Inspection of the state of motorway tunnels in the Republic of Slovenia

DARS 2010 – 2016