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Author(s):	Nipitsch, Gernot; Pacher, Wolfgang
Title:
Abstract:	Contract SBT2.1 Tunnel Fröschnitzgraben is the central and longest construction section of the Semmering Base Tunnel, including 13 km of tunnelling from the intermediate access in Fröschnitzgraben towards Gloggnitz and Mürzzuschlag. The approx. 4 km long section towards Mürzzuschlag is being excavated by drill and blast, and the 9 km section towards Gloggnitz is being driven by two tunnel boring machines. Before the start of the actual construction of the running tunnels, the two shafts about 400 m deep had to be sunk using an innovative concept. Considerable changes are also noticeable above ground: the filling level of the landfill site in Longsgraben is rising constantly. Das Baulos SBT2.1 Tunnel Fröschnitzgraben stellt den mittleren und längsten Abschnitt des Semmering-Basistunnels dar. Auf rund 13 km wird der Tunnel vom Zwischenangriff Fröschnitzgraben aus in Richtung Gloggnitz und Mürzzuschlag aufgefahren. Der etwa 4 km lange Abschnitt in Richtung Mürzzuschlag entsteht im Bagger- und Sprengvortrieb, der etwa 9 km lange Abschnitt in Richtung Gloggnitz wird mit zwei Tunnelvortriebsmaschinen vorgetrieben. Vor Beginn der eigentlichen Arbeiten an den Streckenröhren wurden mit einem innovativen Konzept die beiden rund 400 m tiefen Schächte abgeteuft. Auch über Tage machen sich deutliche Veränderungen bemerkbar: Der Auffüllungsgrad der Deponie Longsgraben steigt beständig an.
Source:	Geomechanics and Tunnelling 10 (2017), No. 6
Page/s:	678-685
Language of Publication:	English/German

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