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Author(s):	Dietzel, Martin; Purgstaller, Bettina; Leis, Albrecht; Reichl, Peter; Stadler, Hermann; Niedermayr, Andrea; Rinder, Thomas; Wagner, Hanns
Title:
Abstract:	Scaling of tunnel drainage systems comprises complex reaction mechanisms, which are essentially caused by the interaction of water with cement-based materials and the atmosphere. The resulting precipitation of CaCO3 in the drainage is an economically highly challenging task for tunnel operators with respect to maintenance and cleaning action. Hydrochemical modelling is used to decipher reaction mechanisms and thus to provide quantifications, which are required to develop monitoring tools, like in-situ alert systems, and prevention strategies, like application of low-eluting shotcrete and inhibitors. Die Versinterung von Tunneldrainagen umfasst komplexe Reaktionsvorgänge, die sich im Wesentlichen auf die Wechselwirkung von Wässern mit zementgebundenen Materialien und der Atmosphäre beziehen. Die hieraus resultierende Abscheidung von CaCO3 in den Dränagen stellt aufgrund von Instandhaltungs- und Reinigungsarbeiten eine große ökonomische Herausforderung für den Tunnelbetreiber dar. Hydrochemische Modellierungen ermöglichen es, Reaktionsabläufe zu erkennen und Bilanzierungen durchzuführen, welche die Voraussetzung für die Entwicklung von Monitoring-Werkzeugen, wie In-situ-Sinter-Wächtern, und von Präventionsstrategien, wie die Anwendung von eluatarmen Spritzbetonsorten und geeigneten Inhibitoren, darstellen.
Source:	Geomechanics and Tunnelling 6 (2013), No. 6
Page/s:	743-753
Language of Publication:	English/German

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