预裂缝对爆破震动信号频率的影响研究

Research on the Influence of Pre-splitting Fissure to the Frequency of Blasting Vibration Signals

在预裂爆破理论的基础上,结合现场预裂爆破试验和实测爆破震动数据,从频率域分析了预裂缝两侧爆破震动信号的变化特征。利用傅里叶变换和连续小波变换,分别得到了预裂缝两侧爆破震动信号的功率谱和尺度能量图。通过对比发现爆破震动信号途经预裂缝后,主震频带变宽,但增加的只是中高频成分,同时爆破震动信号低频成分的能量大幅衰减,主震频带往高频发展。

The data of pre-splitting blasting experiment and measured blasting vibration are used to analyze the change features of the blasting vibration signals of both sides of pre-splitting fissure from fre- quency domain at the basis of Pre-splitting blasting theory. The power spectrum and scale energy figure of blasting vibration signals of both sides of pre-splitting fissure are obtained by adopting the Fourier trans- form and continuous wavelet transform. According to the contrast results, the main frequency bands of high frequency component of the blasting vibration signals become wider, while the energy of low frequency component of the blasting vibration signals is attenuated sharply, besides that, the main frequency bands tend to develop to the high frequency component.