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Title:	Fibre reinforced tunnel linings - design and construction experience
Abstract:	The new Nikachhu hydropower station in Bhutan has an installed capacity of 118 MW and is supplied with 25.45 m3/s via a 12,144 m long, 4 m diameter head race tunnel. Extensive tunnelling works were required for the project. In addition to a diversion tunnel, two adits were built near the dam to be able to access the desilting chambers. Five additional adits had to be built for the head race tunnel, and three adits, a ventilation tunnel, and a main access tunnel were required in the powerhouse. DSI Underground supplied Mai grout-mixing pumps and DSI Hollow Bar Spiles type R32 and T76 for this tunnel project. (photo: DSI Underground) Das neue Wasserkraftwerk Nikachhu in Bhutan hat eine Nennleistung von 118 MW und wird über einen 12, 144 m langen Druckstollen mit 4 m Durchmesser mit 25, 45 m3/s versorgt. Für das Projekt waren umfangreiche Tunnelbauarbeiten erforderlich. Neben einem Umleitungstunnel wurden zwei Stollen zu den Absetzkammern in der Nähe der Staumauer gebaut. Für den Druckstollen mussten fünf zusätzliche Stollen aufgefahren werden, und im Bereich des Maschinenhauses waren drei Querschläge, ein Lüftungsstollen und ein Zugangstunnel erforderlich. DSI Underground lieferte für dieses Tunnelprojekt das DSI Hohlstab-System, Typ R32 und T76, sowie Mai Mörtelmischpumpen. (Foto: DSI Underground)
Source:	Geomechanics and Tunnelling 14 (2021), No. 4
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Language of Publication:	English/German

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