Premium
Überwachung der Deformation einer temporären Kalottensohle mit Time Domain Reflectometry
Author(s) -
Singer John,
Grafinger Helge,
Thuro Kurosch
Publication year - 2009
Publication title -
geomechanics and tunnelling
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.317
H-Index - 18
eISSN - 1865-7389
pISSN - 1865-7362
DOI - 10.1002/geot.200900023
Subject(s) - heading (navigation) , reflectometry , shotcrete , time domain , calibration , computer science , structural engineering , remote sensing , geology , engineering , geodesy , physics , quantum mechanics , computer vision
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.