DBPapers
DOI: 10.5593/SGEM2014/B12/S2.010

ANALYSIS OF TRANSFER COEFFICIENTS BASED ON SEISMIC MEASUREMENTS IN THREE TUNNELS

M. Stolarik , M. Pinka
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-08-7 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 2, 71-78 pp

ABSTRACT
The paper presents the analysis of the transfer coefficients K obtained by experimental seismic measurements on three mined tunnels. The tunnels are part of the IVth railway corridor in the Czech republic, that is a part of the Trains-European Railway E55. All three tunnels were made using the New Austrian Tunnelling Method and blasting operation was used. Seismic measurements of the response of blasting were carried out within a shallow depth under the surface during the works conducted in the underground (future excavation of the tunnel, partial excavation of the floor) and outside of the tunnel. All measurements were realized in the near zone, i.e. at a small distance from the source of vibration (first meters to number of ten meters). The records were evaluated in the amplitude and frequency domain. Langefor’s relationship was chosen as the basis for the interpretation of the measurements data and also Czech national standard 73 0040 - Loads of technical structures by technical seismicity and their response. Transfer coefficients K, based on this standard, were drawed in the graphs depending on the distance from the source of dynamic load. These coefficients (drawed in curve) were compared with the calculated real transfer coefficients for all three tunnels.

Keywords: tunnel, blasting operation, seismic measurement, Langefor’s relationship