关键词: 矿山爆破, 爆破振动, 频谱分布, 经验模态分解, 主成分分析, 高程放大

Abstract: In order to study the spectral distribution characteristics of blasting vibration signal more accurately,combining with a blasting vibration experiment of openpit slope,the principal empirical mode decomposition method (PEMD) is used to filter out the noise in the vibration signal,and the spectral characteristics of the blasting vibration signal of the slope at different elevations are studied.The results show that:① For slopes with developed joints and fissures,under the current initiation method,the dominant frequency band of blasting vibration signal energy is 10~100 Hz,and the energy in the frequency band accounts for 64.2%~88.0% of the total energy.② Among the blasting vibration signals at the same elevation and different vibration directions,the radial peak vibration velocity is the largest,and the concentrated vibration energy in the main vibration frequency band is the largest.③ At a specific elevation of the slope,different frequency components of the blasting vibration signal have selective amplification or attenuation effects,and the energy amplification and attenuation degrees of different vibration directions are not the same.④ As the elevation increases,the peak instantaneous energy of the blasting vibration signal first increases and then decreases,and reaches the maximum where the elevation amplification effect occurs on the slope.