Analysis of Blasting Vibration Signals at Different Initiation Positions of Tunnel Blastholes

Abstract In order to study the blasting vibration effect of different points tunnel bore, pilot in multi-arch was used carry out test bore. The results show that: 1) peak velocity generated by at initiation hole is different, and magnitude reverse > Intermediate Forward initiation; 2) frequency distribution range signal under three positions is: forward Reverse At same time, more conducive main moving high frequency; 3) Compared with intermediate initiation, can better disperse energy, so that energy transferred from low frequency, relatively small, which safety lining structure.