ABSTRACT
Typical waveforms were analyzed in the two blastings. Figure 5 shows that the seismic peak of the regional electronic detonator had about 70% to the non-electronic detonator. Figure 5b and c show the dominant frequency, which mainly focused on the 20-40 Hz range. The amplitude of the regional electronic detonator was about 80% of non-electronic detonator regional. From Figure 6, the second blasting vibration wave peak value clearly tends to disperse at around 0.3 s. The blasting vibration wave reached the first peak and then gradually decayed. At 0.85 s, a symmetric waveform appeared, the maximum vibration speed being more than 14 cm/s. In Figure 6b amplitude-frequency relation can be seen. The dominant frequency was in the 10-30 Hz range, which did not cause structural damage because of resonance higher than the buildings’ inherent frequency.
