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爆破地震波的传播过程受到多种因素的影响,以爆破地震波产生的能量条件为基础,推导了地震波衰减规律与其频谱的理论关系。通过小波包分析的方法,对某露天煤矿实测爆破地震波进行多层分解和重构,分析不同频段地震波的衰减规律。结果表明:爆破地震波能量的衰减与振动频率成正比,地震波在传播过程中低频带能量占总能量的比率随传播距离的增加呈上升趋势。
The propagation of blasting seismic waves is affected by many factors. Based on the energy conditions produced by blasting seismic waves, the theoretical relationship between the attenuation law of seismic waves and its frequency spectrum is deduced. By wavelet packet analysis method, the blasting seismic waves in an open-pit mine are decomposed and reconstructed by multi-layers, and the attenuation law of seismic waves in different frequency bands is analyzed. The results show that the energy attenuation of blasting seismic wave is proportional to the vibration frequency, and the ratio of low frequency band energy to total energy of seismic wave propagates upward with the propagation distance.