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Author(s):	Chiaverio, F.; Thut, A.
Title:
Abstract:	Rocks containing clay and anhydrite exhibit the property of increasing their volume by absorbing water. The paper first discusses the mechanisms causing swelling and outlines their effects on tunnels. Next the hazard scenario of heaving of the tunnel tube as a whole, the structural consequences of this and the concept of the Modular Yielding System for tunnelling in stretches where heave is unavoidable are discussed. Taking the case of the Chienberg road tunnel in Switzerland, the paper also reports on experience during construction and field measurements after putting the repaired sections into operation. Special attention is given to the technical aspects of yielding supports with cement as a basic constituent for loads up to 10 MN and a yielding capacity of up to 50 %. Ton- und anhydritführende Gesteine haben die Eigenschaft, ihr Volumen durch Aufnahme von Wasser zu vermehren. Der Beitrag behandelt einleitend die Mechanismen, die den Quellvorgang auslösen und die Auswirkungen des Quellvorgangs auf Tunnel. Anschließend wird das Gefährdungsbild der Hebungen der Tunnelröhre als Ganzes, deren Folgen auf die Tragkonstruktion und das Konzept des modularen Knautschsystems] für den Tunnelbau in unvermeidbaren Hebungsstrecken erörtert. Am Beispiel des Chienbergtunnels in der Schweiz wird auch über Bauerfahrung und Feldmessungen nach der Inbetriebnahme der sanierten Strecken berichtet. Besondere Aufmerksamkeit wird den technischen Merkmalen von Knautschkörpern auf Zementbasis für Belastungen von bis zu 10 MN und einem Stauchvermögen von bis zu 50 % gewidmet.
Source:	Geomechanics and Tunnelling 3 (2010), No. 5
Page/s:	573-582
Language of Publication:	English/German

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