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Author(s):	Singer, J.; Grafinger, H.; Thuro, K.
Title:
Abstract:	For the objective evaluation of the structural safety of tunnel structures during the construction phase, continuous monitoring of all important structural elements (e.g. tunnel lining) and the tunnel face are of utmost importance. The temporary top heading invert, frequently used in sensitive areas of top heading drives, could not up to now be monitored with measuring equipment, because it is usually covered with infill to form a temporary haul road. The application of a Time Domain Reflectometry (TDR) measurement system makes it possible for the first time to detect, localise and quantify failures in the shotcrete lining. The calibration of the TDR measurement system in laboratory tests and the experience gained through a practical trial in the Lainzer tunnel in Vienna have made it possible to determine the capabilities and limits of this measuring system and demonstrate its readiness for practical use. Für eine objektive Beurteilung der Standsicherheit von Tunnelbauwerken während der Bauphase ist eine kontinuierliche messtechnische Überwachung aller wichtigen Bauteile (z.B. Tunnelschale) sowie der Ortsbrust von entscheidender Bedeutung. Die beim Kalottenvortrieb häufig in sensiblen Bereichen eingesetzte temporäre Kalottensohle hat sich bisher einer messtechnischen Überwachung entzogen, da sie in der Regel für die Errichtung einer temporären Fahrbahn mit Ausbruchmaterial überschüttet wird. Durch den Einsatz eines Time Domain Reflectometry (TDR) Messsystems ist es nun erstmals möglich, in der Spritzbetonschale auftretende Brüche zu erkennen, zu lokalisieren und zu quantifizieren. Durch die Kalibrierung des TDR-Messsystems in Laborversuchen und der Durchführung eines Praxisversuchs im Lainzer Tunnel (Wien) konnten die Möglichkeiten und Grenzen der Messmethode ermittelt sowie die Praxistauglichkeit des Systems unter Beweis gestellt werden.
Source:	Geomechanics and Tunnelling 2 (2009), No. 3
Page/s:	238-249
Language of Publication:	English/German

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