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Author(s):	Gollegger, Johannes
Title:	Experience from pre-excavation and leakage closing injections obtained in the Follo Line Project
Abstract:	More and more projects use single-shell segmental lining for rock support as well as water and frost protection. Unless the potential water pressure is very high, i.e., above several hundreds of meters, these lining structures are usually built as undrained fully watertight tunnels. The Follo Line Project included a considerable amount of pre-excavation grouting to reduce the water ingress during construction and invested a lot in injections to close leakage points after the tunnel excavation had finished. This article discusses the various types of injections and reflects critically the use of single-shell linings for tunnels with high water pressure. Erfahrungen von vorauseilenden und Abdichtungsdichtungsinjektionen beim Follo Line Projekt Immer mehr Projekte verwenden einschalige Tübbingauskleidungen zur Felssicherung sowie zum Wasser- und Frostschutz. Sofern der potenzielle Wasserdruck nicht sehr hoch ist, über mehrere hundert Meter, werden diese Bauwerke normalerweise als undrainierte, vollständig wasserdichte Tunnel gebaut. Das Follo Line Projekt führte während des Vortriebes umfangreiche vorauseilende Injektionen durch, um das Eindringen von Wasser während des Baus zu reduzieren und investierte viel in Injektionen, um Leckstellen nach Abschluss der Vortriebsarbeiten zu schließen. Dieser Beitrag diskutiert die verschiedenen Injektionsarten und reflektiert kritisch den Einsatz einschaliger Auskleidungen für Tunnel mit hohem Wasserdruck.
Source:	Geomechanics and Tunnelling 15 (2022), No. 5
Page/s:	550-554
Language of Publication:	English/German

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