TSWD – STATE OF THE ART AND CURRENT DEVELOPMENTS

PreviousNext No AccessSymposium on the Application of Geophysics to Engineering and Environmental Problems 2014TSWD – STATE OF THE ART AND CURRENT DEVELOPMENTSAuthors: Ingrid KreutzerIngrid KreutzerVienna University of TechnologySearch for more papers by this authorhttps://doi.org/10.4133/SAGEEP.27-186 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract The Tunnel Seismic While Drilling (TSWD) method has been developed to predict the geological situation ahead of the tunnel face without disturbing the construction progress in the case a Tunnel Boring Machine (TBM) is operating. The vibrations of the TBM are used as the seismic source and processing of the seismic data is targeted to the detection of reflections from fault zones ahead of the tunnel face. Modern TBM's achieve advance rates up to 50 m per day. Near real time processing and at least daily prediction is essential. These circumstances put high demands on instrumentation, data transmission, processing, and logistics. The principles of the methodology and the state of the art will be presented. Until now we applied TSWD at four tunnel construction sites in Austria. Optimized adaptation of the TSWD technique to the particular TBM type represents a further challenge. It will be shown how instrumentation and processing have to be adapted individually for each tunnel. The final interpretation of the seismic data contains a prognosis about 100 m ahead of the TBM including location, thickness, and geometry of construction relevant geological features. A close collaboration with geologists on site supports an adequate interpretation. Current developments which aim further improvements will be addressed. The comparison of the TSWD results with the encountered geology shows that wider fault zones over a thickness of 10 m can be successfully resolved, smaller fault zones are partly detected. General, there is a prediction accuracy of about 5 m for the beginning of the structures. It was possible to detect 80% of the prominent faults or transition zones at all tunnel sites. On the strength of past experiences faults with a high risk impact on the tunnel construction can be clearly defined. Keywords: seismic, TBM, prediction, continous, hard rockPermalink: https://doi.org/10.4133/SAGEEP.27-186FiguresReferencesRelatedDetails Symposium on the Application of Geophysics to Engineering and Environmental Problems 2014ISSN (online):1554-8015Copyright: 2014 Pages: 559 publication data© 2014 Published in electronic format with permission by the Society of Exploration Geophysicists and Environment and Engineering Geophysical SocietyPublisher:Environmental & Engineering Geophysical Society HistoryPublished Online: 25 Aug 2014 CITATION INFORMATION Ingrid Kreutzer, (2014), "TSWD – STATE OF THE ART AND CURRENT DEVELOPMENTS," Symposium on the Application of Geophysics to Engineering and Environmental Problems Proceedings : 533-536. https://doi.org/10.4133/SAGEEP.27-186 Plain-Language Summary KeywordsseismicTBMpredictioncontinoushard rockPDF DownloadLoading ...