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Author(s):	Krenn, Harald; Roner, Manfred; Bauert, Michael; Wannenmacher, Helmut
Title:	Deformation measurement and long-term behaviour of passively prestressed pressure tunnels through the example of the Niagara Tunnel Facility Project / Verformungsmessung und Langzeitverhalten von passiv vorgespannten Druckstollen am Beispiel des Niagara Tunnel Facility Projekt
Abstract:	The recently completed Niagara Tunnel Facility Project in the province of Ontario in Canada is an extension of the Sir Adam Beck hydropower station originally built in the 19th century. The project includes the construction of a diversion tunnel to supply the existing hydropower station with an additional 500 m3 of water per second. The long-term stability of the unreinforced concrete lining is assured by a passive prestressed concrete lining according to the principles of Seeber. The operational water pressures reach 13 bar at the deepest point of the tunnel. In order to be able to monitor the slight deformations of the lining in the course of the prestressing process, an innovatively thought-out method of surveying had to be developed. The results of the deformation and long-term monitoring are presented. Das kürzlich fertiggestellte Niagara Tunnel Facility Projekt in der Provinz Ontario in Kanada ist eine Erweiterung des im 19. Jahrhundert erbauten Sir Adam Beck Wasserkraftwerks. Das Projekt umfasst den Bau eines Umleitungsstollens, der das bestehende Wasserkraftwerk mit zusätzlichen 500 m3 Wasser pro Sekunde speist. Für die langfristige Stabilität der unbewehrten Betonschale wird die Schale nach dem Prinzip der passiven Vorspannung nach Seeber vorgespannt. Die betrieblichen Wasserdrücke erreichen am tiefsten Punkt des Tunnels rund 13 bar. Um die geringen Verformungen der Schale im Zuge des Vorspannungsprozesses messtechnisch überwachen zu können, musste eine innovative Vermessungsmethode entwickelt werden. Ergebnisse der Verformungs- und der Langzeitmessung werden vorgestellt.
Source:	Geomechanics and Tunnelling 6 (2013), No. 5
Page/s:	398-406
Language of Publication:	English/German

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