【摘要】 采用db8作为小波基函数,对石龙山隧道同一炮次下垂直向、水平切向和水平径向的原始爆破振动信号进行尺度为7的一维离散小波变化。通过MATLAB程序分别计算了原始信号、各层小波的功率谱及能量比例;详细分析了各层小波的幅值特性、频谱特性及能量分布特性。研究结果表明:垂直向、水平切向和水平径向的优势频率分别为78.125～2 500 Hz、39.062 5～312.5 Hz和39.062 5～625 Hz。该分析方法在频率及能量分析方面的优势可以更加全面地获取爆破振动信号所带来的信息。更多还原

【Abstract】 Using db8 as wavelet basis function,one-dimensional discrete wavelet transform on blasting seismic signals in vertical,horizontal tangential and horizontal radial directions under the same blasting of Shilongshan Tunnel is made within the scale of 7.The original signal,the layers of the wavelet power spectrum and the energy ratio are made by Matlab program.Then the amplitude,spectral characteristics and energy distribution characteristics of the layers of wavelet are analyzed in detail.The results show that the vertical,horizontal tangential and horizontal radial dominant frequency are 78.125～2 500 Hz,39.062 5～312.5 Hz and 39.062 5～625 Hz respectively.The advantages of this method in frequency and energy analysis can get more comprehensive access to the information caused by blasting vibration signals.更多还原