iC was represented at the Tunnelling Association of Canada with a lecture by Erich Neugebauer:
“The Semmering Base Tunnel is a major railway infrastructure project in Austria, Europe. It consists of two 17 miles long single track tunnels, numerous cross passages and a complex underground emergency station including caverns, passages, supplementary tunnels and two 1,315 ft deep ventilation shafts. Construction access to the base tunnel is provided from the portals and from two intermediate access points, at one point by a 1.1 mile long temporary tunnel together with two 820 ft. deep subsurface shafts and at the other point by two temporary shafts of about 1.315 ft depth directly from surface, used later as permanent ventilation shafts together with large underground caverns at the base. The maximum tunnel overburden amounts to about 2,850 ft. The ground conditions along the base tunnel are characterized by difficult, frequently changing geological conditions with large fault zones and extensive water inflow up to 300 l/s requiring special grouting and support measures. The underground construction works using SEM and TBM methods commenced in 2014 and are expected to be completed by 2026.”
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