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Title:	From dust till dawn - Experience from 14 km of "dry tunnel drive" / From dust till dawn - Baubetriebliche Erfahrungen aus 14 Kilometer "Trockener Vortrieb"
Abstract:	As part of the reorganization of the Stuttgart railway node, many tunnels had to be driven through the rock formation of gypsum Keuper (Grabfeld Formation), which contains anhydrite. In contact with water, the mineral anhydrite converts into the mineral gypsum with a resulting increase of volume. To prevent damage to the tunnel structure and the buildings above the tunnel as a result of this swelling process, the tunnelling work had to be carried out dry. No water was allowed for cleaning, drilling or for dust reduction. Dry tunnelling for hundreds of metres in this form and intensity is a novelty. There were no empirical values. In this article the special features of a dry tunnelling are presented. A target-actual comparison or geotechnical deformations should be deliberately avoided, although some peculiarities only result from changes to the contractual framework. Im Rahmen der Neuordnung des Bahnknotens Stuttgart mussten viele Tunnel im anhydritführenden Gipskeuper (Grabfeld Formation) vorgetrieben werden. Das Mineral Anhydrit wandelt sich in Kontakt mit Wasser in das Mineral Gips um, was eine Volumenzunahme zur Folge hat. Um Schäden am Tunnelbauwerk und an der oberhalb der Tunnel befindlichen Bebauung in Folge dieses Schwellprozesses auszuschließen, mussten die Vortriebe trocken erfolgen. Es durfte kein Wasser zum Reinigen, zum Bohren oder zur Staubniederschlagung eingesetzt werden. Über viele hunderte Meter Tunnel trocken vorzutreiben, stellt in dieser Form und Intensität ein Novum dar. Erfahrungswerte lagen nicht vor. In diesem Beitrag sollen die Besonderheiten eines trockenen Vortriebs dargestellt werden. Auf einen Soll-Ist-Vergleich oder auf geotechnische Verschiebungen wurde hierbei verzichtet, wenngleich einige Besonderheiten erst aus Änderungen der vertraglichen Rahmenbedingungen resultieren.
Source:	Geomechanics and Tunnelling 13 (2020), No. 3
Page/s:	302-312
Language of Publication:	English/German

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