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  Design and Construction of Semmering Base Tunnel

  Semmering Base Tunnel, a 27 km long twin tube railway tunnel in Austria, is part of the Baltic-Adriatic Railway Corridor and one of the major infrastructure projects currently under construction in Europe. Apart from the main tunnels and more than 50 cross passages the tunnel system includes an underground emergency and ventilation station with 400 m deep shafts, numerous caverns and passages. Intermediate access points consist of temporary shafts and caverns with two 200 m deep shafts constructed sub-surface at the end of a 1.2 km long access tunnel. The underground structures are excavated by means of NATM and TBM method in a challenging geological environment including frequently changing conditions, fault zones and sections of high water inflow of up to 300 l/s.

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