Abstract
In this work, based on the blasting vibration live data collected, the energy distributions at different frequency bands for the blasting vibration signals were obtained by the wavelet packet analysis technology. By comparing the results of each point analysis it was found that the tunnel excavation blasting seismic wave energy mainly concentrated in the tangential and radial directions; along the direction of the tunnelling, with the increase of the distance between the tunnel faces, the main frequency of the seismic wave decreased and the energy concentration frequency band became narrower and developed to the low frequency band; however, along the vertical direction of the tunnel, the main frequency decreases with the decrease of the depth and, at the same time, the wave energy concentration frequency band became narrower and developed to the low frequency band. The results show that wavelet packet analysis is an effective approach to estimating the structure safety under blasting vibration conditions.
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