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Seismic prediction ahead of tunnel construction using tunnel surface-waves

Jetschny, Stefan; De Nil, Denise; Bohlen, Thomas

Abstract:
To increase safety and efficiency of tunnel constructions, online seismic exploration ahead of a tunnel can become a valuable tool. We developed a new forward looking seismic imaging technique to e.g. determine weak and water bearing zones ahead of the constructions. Our approach is based on the excitation and registration of tunnel surface-waves (TS-waves). These waves are excited at the tunnel face behind the cutter head of a tunnel boring machine and travel into drilling direction. Arriving at the front face they generate body-waves (mainly S-waves = ”RS”-waves) propagating further ahead. Reflected S-waves are back-converted into tunnel surface-waves (”RSSR”-waves) and can be recorded by geophones mounted on the tunnel wall. Using 3D Finite Difference modeling, an analytical solution of the wave equation in cylindrical coordinates and field data acquired at the Gotthard massive (Switzerland) we investigated the propagation characteristics of tunnel surface waves in terms of dispersion and polarization. Understanding the excitation and propagation of TS-waves is the key for developing processing and imaging techniques for our seismic look ahead prediction in tunnel constructions.

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Volltext §
DOI: 10.5445/IR/1000028843
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Zugehörige Institution(en) am KIT Geophysikalisches Institut (GPI)
Publikationstyp Proceedingsbeitrag
Jahr 2009
Sprache Englisch
Identifikator ISBN: 978-1-615-67051-2
ISSN: 1554-8015
urn:nbn:de:swb:90-288431
KITopen-ID: 1000028843
Erschienen in 22nd Symposium on the Application of Geophysics to Engineering and Environmental Problems 2009 (SAGEEP 2009), 29 March - 2 April 2009, Forth Worth, Texas; Vol. 2
Verlag Curran, Red Hook (NY)
Seiten 962-967
Serie Proceedings of SAGEEP ; 22
Nachgewiesen in Scopus
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