深孔台阶爆破振动衰减及信号能量频域分布特征

Vibration Attenuation and Frequency Domain Distribution Characteristics of Signal Energy in Deep Hole Step Blasting

为分析露天矿深孔台阶爆破振动幅值和频率随水平距离和高程变化的衰减规律,进行了5次爆破振动测试,分析了不同地形条件下爆破振动的衰减特点;利用小波包方法分析爆破振动信号能量的频域分布。结果表明,露天深孔台阶爆破振动存在明显的高程放大效应,三向振速中水平向振速较大,主振频率为7~10 Hz,爆破振动信号能量主要分布在7.3~14.6 Hz和14.6~29.3 Hz频带。

In order to analyze the attenuation law of blasting vibration amplitude and frequency with horizontal distance and elevation in deep-hole bench blasting in open pit mines,five blasting vibration tests were carried out,and the attenuation characteristics of blasting vibration under different terrain condi⁃tions were analyzed.The frequency domain distribution of blasting vibration signal energy is analyzed by wavelet packet method.The results show that there is an obvious elevation amplification effect in the blast⁃ing vibration of the open-air deep hole step,the horizontal vibration speed is larger in the three-way vibra⁃tion speed,and the main vibration frequency is 7~10 Hz.The blasting vibration signal energy is mainly dis⁃tributed in the frequency bands of 7.3~14.6 Hz and 14.6~29.3 Hz.