The Influence Study of Elevation Difference on the Propagation of Blasting Seismic Wave

In order to investigate the elevation difference influence on particle peak velocity, frequency characteristics and energy distribution of blasting vibration signals, experiments of blasting vibration were carried out at a Limestone open-pit mine. The blasting vibration signals and propagation law under elevation differences were analyzed with the methods of wavelet packet and numerical simulation respectively. The results of wavelet packet showed that the energy distribution of blasting vibration was mainly concentrated on the blasting frequency from 0 Hz to 30 Hz. Moreover, with the positive altitude increases, the percentage of the energy under 0∼15.6 Hz bands increases from 52.6% to 98.1%. However, the percentage of the energy under 15.6 Hz∼62.5 Hz bands decreases from 47.1% to 1.75%. The results of numerical simulation showed that there were significant amplification effects of blasting vibration velocity under positive elevation difference, and the amplification coefficient increased firstly and then decreased.