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Author(s):	Lienhart, Christoph; Chiaverio, Flavio; Rauscher, Wolfgang; Kurtz, Matthias
Title:
Abstract:	The Feuerbach and Bad Cannstatt Tunnels on the Stuttgart 21 project are two central elements of the future Stuttgart inner-city rail node. Due to the central location in the middle of Stuttgart, there are particular requirements for construction operations and logistics. These effects are additionally reinforced by the very difficult geological and geotechnical conditions in the valley of Stuttgart: very changeable strengths of the prevailing formations of the gypsum Keuper, sometimes with shallow overburden with dense building and roads above. The tunnel also passes through sections with anhydrite content, which tends to swell on contact with water. In this paper, both the challenges of the inner-city location are described and the methods and solutions used to counter an impairment of structural safety and serviceability in the anhydrite sections. Die Tunnel Feuerbach und Bad Cannstatt des Projekts Stuttgart 21 sind zwei zentrale Elemente des künftigen Bahnknotens der Stuttgarter Innenstadt. Aufgrund der zentralen Lage mitten in Stuttgart ergeben sich bei beiden Tunneln besondere Anforderungen an den Baubetrieb und die Baulogistik. Diese Effekte werden zusätzlich verstärkt durch sehr schwierige geologische und geotechnische Verhältnisse im Stuttgarter Talkessel: Sehr wechselhafte Festigkeiten der anstehenden Formationen des Gipskeupers bei z. T. geringer Überlagerung zur darüber liegenden dichten Bebauung und den Verkehrsflächen. Darüber hinaus durchörtern beide Tunnel anhydritführende Abschnitte, die bei Zutritt von Wasser zum Quellen neigen. In diesem Beitrag werden sowohl die sich aus der innerstädtischen Lage ergebenden Herausforderungen beschrieben als auch die Methoden und Lösungen, mit denen in den Anhydritstrecken einer Beeinträchtigung von Standsicherheit und Gebrauchstauglichkeit der beiden Tunnel begegnet wird.
Source:	Geomechanics and Tunnelling 12 (2019), No. 5
Page/s:	456-466
Language of Publication:	English/German

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