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Author(s):	Brandtner, Markus; Lenz, Gerold
Title:
Abstract:	The Semmering Base Tunnel with a total length of approx. 27 km is being driven through a complex system of fault zones. During the investigation period, technically demanding site investigations were carried out to obtain information on geological and hydrological conditions including the determination of the strength and stiffness of the faulted zones. The results formed the basis for the geotechnical design, performed according to the Guideline for the Geotechnical Design of Underground Structures with Conventional Excavation published by the Austrian Society for Geomechanics. According to the regulations, the system behaviour must already be tested against the designed support measures during the design stage. In this case the behaviour was assessed using a complex 3D Finite Element model. The expected and therefore predicted system behaviour represents the baseline for the observational method. Der Semmering Basistunnel mit einer Gesamtlänge von ca. 27 km wird in einem äußerst komplexen Störungssystem vorgetrieben. Im Vorfeld wurden aufwändige Baugrunderkundungen angestellt, die auch umfangreiche Untersuchungen der hydraulischen Bedingungen sowie die Bestimmung der Festigkeit bzw. Steifigkeit des Gebirges in den Störungszonen umfassten. Die Ergebnisse der Vorerkundung bildeten die Basis für die Planung gemäß ÖGG Richtlinie für die geotechnische Planung von Untertagebauten mit zyklischem Vortrieb. Der Richtlinie entsprechend ist bereits im Planungsprozess das Systemverhalten bei der Festlegung der Baumaßnahmen zu überprüfen. Im gegenständlichen Fall wurde die Systemantwort anhand eines 3D Finite Elemente Modells ermittelt. Das erwartete und somit prognistizierte Systemverhalten stellt die Ausgangsbasis für die Beobachtungsmethode dar.
Source:	Geomechanics and Tunnelling 10 (2017), No. 4
Page/s:	353-365
Language of Publication:	English/German

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