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Abstract:	The 665 m long, twin-track Untersammelsdorf Tunnel is being built in the course of the construction of the Koralmbahn line between Graz and Klagenfurt. The tunnel is located in extremely challenging subsoil conditions consisting of silty to fine sandy lacustrine deposits. The developed tunnelling concept provided wide-ranging special underground engineering measures and represents a unique construction method to date. Accordingly, numerous challenges arose in the design phase, which were verified by carrying out extensive trials and investigations in the preparatory period or for which fallback levels had to be provided for the support system. Now tunnelling work is almost complete, the experience can be reported. Im Zuge der Errichtung der Koralmbahn zwischen Graz und Klagenfurt ist der 665 m lange, zweigleisige Tunnel Untersammelsdorf zu errichten. Der Tunnel liegt in extrem herausfordernden Untergrundbedingungen bestehend aus schluffigen bis feinsandigen Stillwassersedimenten. Das Vortriebskonzept sah umfangreiche Spezialtiefbaumaßnahmen vor und stellt eine bisher einmalige Bauweise dar. Dementsprechend ergaben sich in der Planung zahlreiche Problemstellungen, die mittels umfangreicher Versuche und Untersuchungen in der Vorbereitungsphase geklärt werden konnten oder für die Rückfallebenen im Tragsystem geschaffen werden mussten. Nachdem die Vortriebsarbeiten nahezu abgeschlossen sind, kann über die gemachten Erfahrungen berichtet werden.
Source:	Geomechanics and Tunnelling 11 (2018), No. 5
Page/s:	450-461
Language of Publication:	English/German

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