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Author(s):	Sellner, Peter J.; Sonnleitner, Herbert
Title:
Abstract:	In 2013 Asfinag published the tender for the construction of the second tube of the Gleinalm Tunnel. The tunnel is situated in hard rocks (gneiss) and the tender design contained excavation works realized by “drill and blast” in a top heading, bench and invert sequence. Additionally to this tender design, technical alternatives were allowed. One of the tenderers, the later contractor, offered both, a concept according to the tender and an alternative excavation concept including full face excavation by drill and blast. This alternative was based on considerations and experience the tenderer had gained from the construction works of the first tube in the early 1970s presuming optimal full face excavation conditions over wide areas of the tunnel and thus reducing time and costs. Due to these economic advantages and the low cost risk the owner finally commissioned the alternative. Minimizing the blasting vibration of the full face excavation on the nearby running tube, which was operated without any disturbance, was only one of the challenges of the project. In terms of logistics the supply of the excavation works with air and support materials as well as the huge mucking volume to be transported were identified as limiting factors. Das im Jahr 2013 ausgeschriebene Vortriebskonzept für die zweite Röhre des Gleinalmtunnels hat den Ausbruch grundsätzlich als Sprengvortrieb in den Teilquerschnitten Kalotte, Strosse und Sohle vorgesehen, jedoch auch technische Alternativen zugelassen. Durch die später beauftragte Bietergemeinschaft wurde neben dem Hauptangebot auch eine Alternative eingereicht, die über weite Bereiche des Tunnels den Sprengvortrieb im Vollausbruch beinhaltet, und auf geologischen und geotechnischen Überlegungen beruht. Aufgrund der Wirtschaftlichkeit und Kostensicherheit wurde die Alternative beauftragt. Die Minimierung von Sprengerschütterungen im Zuge des Vollausbruchs im Zusammenhang mit der parallel verlaufenden und in Betrieb befindlichen Bestandsröhre stellt nur eine Herausforderung dar, die es zu bewältigen galt. Logistisch gesehen befand sich die Versorgung der Vortriebe im Grenzbereich des Machbaren.
Source:	Geomechanics and Tunnelling 9 (2016), No. 5
Page/s:	428-434
Language of Publication:	English/German

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