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Author(s):	Gschwandtner, Gunter Gernot; Lenz, Gerold; Wagner, Oliver Kai
Title:
Abstract:	The Semmering Base Tunnel with a total length of 27.3 km is being excavated from the Gloggnitz portal as well as from three intermediate faces at Göstritz, Fröschnitzgraben and Grautschenhof. The geological conditions of the project are characterized by tectonically extremely complex rock formations with difficult geotechnical conditions. The excavation passes through numerous fault zones with deep overburden. During the excavation works, some large-volume collapses occurred. In this article, the collapse events are reconstructed from the available geological and geotechnical information. The reconstruction of the observed system behaviour is based on analytical and numerical calculations. The aim is to identify the respective failure mechanisms. Der Semmering-Basistunnel mit einer Gesamtlänge von 27,3 km wird vom Portal Gloggnitz sowie von den drei Zwischenangriffen Göstritz, Fröschnitzgraben und Grautschenhof aus aufgefahren. Die geologischen Verhältnisse des Projekts sind durch einen tektonisch äußerst komplexen Gebirgsaufbau mit teils schwierigen geotechnischen Verhältnissen geprägt. Die Vortriebe durchörtern zahlreiche Störungszonen mit hoher Überlagerung. Im gegenständlichen Beitrag werden Nachbruchereignisse auf Basis der vorliegenden geologischen und geotechnischen Informationen aus den Vortrieben rekonstruiert. Die Nachbildung des beobachteten Systemverhaltens erfolgt mittels analytischer und numerischer Berechnungen. Ziel der Rekonstruktion ist die Identifikation der jeweiligen Versagensmechanismen.
Source:	Geomechanics and Tunnelling 12 (2019), No. 6
Page/s:	667-673
Language of Publication:	English/German

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