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Abstract:	During the advance of the Gotthard Base Tunnel, the members of the AlpTransit Gotthard AG had to face various challenges due to unforeseen ground conditions. In section Sedrun West the team had to face the sudden access of water of up to 13 l/s. Two tunnel jumbos were used for drilling grouting holes, arranged so that they would enter the fault zone at right angle. (pp. 215 to 245). Der Vortrieb des Gotthard Basis Tunnels stellte die Mitarbeiter der AlpTransit Gotthard AG an mehreren Stellen aufgrund unvorhersehbarer Baugrundverhältnissen vor Herausforderungen. Im Abschnitt Sedrun Süd West musste das Team den unerwarteten Wasserzutritt in Mengen bis zu 13 l/s stoppen. Zwei Vortriebsjumbos wurden für die Injektionsmaßnahme eingesetzt. Das Ziel war, einen zuflussreduzierenden Injektionsschirm zu erstellen, senkrecht zur Störzone. (S. 215 bis 245)
Source:	Geomechanics and Tunnelling 6 (2013), No. 3
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Language of Publication:	English/German

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