Index Geophysics

eng DYNAMIC INFLUENCE CAUSED BY CLOSE BLASTING ON PRIMARY AND SECONDARY SUPPORT SYSTEM IN TUNNEL "SV. ROK"

hrv DINAMIČKI UTJECAJ BLISKOG MINIRANJA NA PRIMARNI I SEKUNDARNI POTPORNI SUSTAV U TUNELU "SV. ROK"

eng At the construction site of the road tunnel Sv. Rok, the second, left tunnels tube is being constructed parallel to the unfinished right tunnel. The part of right tunnel tube is supported with primary support system according to NAMT, the second part is supported complete with concrete. Distance between axes of the tunnel tubes is approximately 35 m. Drifting of the left tube is being done by blasting. A potential problem of damaging the surrounding rock and support system was recognized. It is well known that the ground vibration particle velocity due to a blast is a measure of damage on the nearby construction. The three component seismographs were used to measure ground oscillation velocities in the right tunnel tube. Total of 30 measurements were executed and 720 values were processed (including all three component oscillation velocities). Maximum ground oscillation velocity recorded was 232.061 mm/s. This paper brings conclusion derived from monitoring data achieved at close proximity to the blasting area, damage level criteria for the rock mass and support system and discusses how these results could assist further development in the control of blasting technique.

hrv Prilikom izgradnje cestovnog tunela Sveti Rok, lijeva tunelska cijev probija se paralelno nedovršenoj desnoj cijevi. Desna tunelska cijev djelomično je podgrađena primarnom podgradom prema NATM (Nova Austrijska Tunelska Metoda) a djelomično završnom betonskom oblogom. Udaljenost između osi tunelskih cijevi je približno 35 m. Iskop lijeve tunelske cijevi je miniranjem te su moguća oštećenja okolne stijene i podgradnog sustava. Poznato je da su brzine oscilacija stijene uzrokovane miniranjem mjera za određivanje mogućih oštećenja na ugroženim objektima i konstrukcijama. Prilikom mjerenja brzina oscilacija stijene u desnoj tunelskoj cijevi, korišteni su trokomponentni seizmografi. Iz 30 mjerenja obrađeno je 720 podataka o brzinama oscilacija (uključujući sve tri komponentne brzine oscilacija). Najveća izmjerena brzina oscilacija iznosila je 231.061 mm/s. U radu su dani zaključci bazirani na mjerenjima na malim udaljenostima od minskog polja o dozvoljenoj brzini oscilacija u odnosu na moguća oštećenja stijenske mase i podgradnog sustava u svrhu razumjevanja odnosa između minerskih parametara, brzina oscilacija stijene i nastanka mogućih oštećenja pri miniranju na malim udaljenostima u podzemlju.

Ester, Zvonimir

Dobrilović, Mario

Vrkljan, Darko

eng tunnel;blasting;seismic effects;primary and secondary tunnel support system

hrv tunel;miniranje;seizmički utjecaji;primarna i završna tunelska podgrada

Faculty of Mining, Geology and Petroleum Engineering University of Zagreb

2003

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Rudarsko-geološko-naftni zbornik

ISSN 1849-0409 (Online)

Volume 15

Issue 1

eng

info:eu-repo/semantics/openAccess

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