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Author(s):	Barwart, Christian; Romualdi, Paolo; Barioffi, Alberto
Title:	Headrace tunnel of the El Alto hydropower project in Panama / Druckstollen des Wasserkraftprojekts El Alto in Panama
Abstract:	The 3.3 km long headrace tunnel (Lot 2) of El Alto hydropower project in Panama has been tendered as drill and blast excavation. Lot 2 has been arwaded to SELI, Rome/Italy. By using an EPB TBM for tunnel excavation general alignment of tunnel has to be redesigned completely. General and detailed design has been done by viglconsult ZT/Schruns. Internal pressure conditions does allow to use segmetnal ining as final lining most of the tunnel length. Only the last 300m of tunnel does have the requirement of inner lining made of steel. Traditional bar reinforcement has been substitued with steel fibre reinforcement with ductile post crack behaviour. A three-step grouting programm is foreseen to gain segment stability and is responsible for sealing of the headrace tunnel. Der 3,3 km lange Druckstollen (Baulos 2) des 67 MW Wasserkraftwerkes “El Alto” in Panama wurde als zyklischer Vortrieb ausgeschrieben. Das gegenständliche Baulos wurde als “EPC Contract” an SELI SPA, Rom vergeben. Durch den Einsatz einer EPB TBM mit Tübbingauskleidung bedurfte es einer grundlegenden Umplanung der Trassenführung in Grund und Aufriss. Die generelle sowie Detailplanung wurde von viglconsult ZT aus Schruns durchgeführt. Die Innendruckverhältnisse ließen größtenteils eine nicht “druckhaltende” Auskleidung zu, während die letzten 300 m einer Stahlpanzerung bedurften. Eine spezielle Stahlfaserbewehrung welche mit duktilem Nachrissverhalten ersetze die konventionelle Stabebewehrung in den Tübbingen. Ein dreistufiges Injektionskonzept sorgt für entsprechende Stabilität und Dichtheit des Druckstollens.
Source:	Geomechanics and Tunnelling 6 (2013), No. 4
Page/s:	301-311
Language of Publication:	English/German

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