• geologial, tectonical and geotechnical ahead investigation of the bedding rock
  • detection of karst zones, cavities, faults, fractures and water pathways in the surrounding rock
  • possible investigation methods: investigation of the tunnel path from the surface, parallel to the excavation from the tunnel face, succeeding the excavation of the tunnel (before installation of the tunnel lining)
  • verification of consolidation filling of known voids/cavities
  • Result of the 3D loalization of a cavity close to the tunnel tube
  • Cavity detection using gravimetry inside a tunnel
  • Radar measurements from angled boreholes around a tunnel tube


  • 2018: Karst exploration along the path of the Divaca-Koper tunnel using borehole radar
  • 2018: Karst exploration of the emergency drives of the Lämmerbuckel Tunnel (Stuttgart 21) using borehole radar
  • 2016 – 2017: Karst exploration of the Boßler Tunnel (Stuttgart 21) using borehole radar and gravimetry
  • 2014 – 2016: Karst exploration of the Steinbühl Tunnel (Stuttgart 21) using borehole radar and gravimetry
  • 2008 – 2009: Karst exploration of the Osterberg Tunnel using geoelectrics
  • 2005 – 2007: Karst exploration of the Katzenberg Tunnels using borehole radar