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http://dx.doi.org/10.9711/KTAJ.2010.12.3.247

Analysis of the peak particle velocity and the bonding state of shotcrete induced by the tunnel blasting  

Hong, Eui-Joon ((주)유신 터널부)
Chang, Seok-Bue ((주)유신 터널부)
Song, Ki-Il (UiTM 토목공학과)
Cho, Gye-Chun (KAIST 건설 및 환경공학과)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.12, no.3, 2010 , pp. 247-255 More about this Journal
Abstract
Bonding strength of shotcrete is a significant influential factor which plays the role of collapse prevention of tunnel crown and of debonding prevention of shotcrete induced by the blasting vibration. Thus, the evaluation of the shotcrete bonding state is one of the core components for shotcrete quality control. In this study, the peak particle velocities induced by blasting were measured on the shotcrete in a tunnel construction site and its effect on the bonding state of shotcrete is investigated. Drilling and blasting technique was used for the excavation of intersection tunnel connecting the main tunnel with the service tunnel. Blast-induced vibrations were monitored at some points of the main tunnel and the service tunnel. The shotcrete bonding state was evaluated by using impact-echo test coupled with the time-frequency domain analysis which is called short-time Fourier transformation. Analysis results of blast-induced vibrations and the time-frequency domain impact-echo signals showed that the blasting condition applied to the excavation of intersection tunnel hardly affects on the tunnel shotcrete bonding state. The general blasting practice in Korea was evaluated to have a minor negative impact on shotcrete quality.
Keywords
Blast-induced vibration; bonding state; shotcrete; time-frequency domain analysis; impact-echo test;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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