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结合贵州某露天矿爆破施工工程,分别采用ANSYS/LS-DYNA数值模拟软件和小波包分析方法对结构面影响下的爆破振动的幅频衰减规律进行分析研究。数值模拟结果表明,爆破地震波在未穿过结构面之前和穿过结构面后,振速峰值没有明显的衰减,其平均衰减率分别为7.96%和8.74%。而地震波穿越结构面时,振速峰值衰减明显,其平均衰减率为54.04%。小波包分析结果表明,当地震波穿越结构面时,50 Hz左右频带的能量均呈衰减趋势,其中水平向信号能量降幅为33.78%,垂直向信号能量降幅为31.68%。而20Hz左右频带的能量呈增加趋势,其中水平向信号能量增幅为18.09%,垂直向信号能量增幅为16.12%。
Combined with the blasting construction project of an opencast mine in Guizhou, the amplitude attenuation rules of blasting vibration under the influence of the structural plane were analyzed by ANSYS / LS-DYNA numerical simulation software and wavelet packet analysis respectively. The numerical simulation results show that there is no obvious attenuation of the peak velocity of blasting seismic waves before and after passing through the structural plane, and the average attenuation rates are 7.96% and 8.74% respectively. When the seismic wave traverses the structural plane, the peak attenuation of vibration velocity is obvious, and the average attenuation rate is 54.04%. The results of wavelet packet analysis show that when the seismic wave crosses the structural plane, the energy in the frequency band of about 50 Hz decays, in which the energy drop of horizontal signal is 33.78% and that of vertical signal is 31.68%. However, the energy in the band around 20 Hz shows an increasing trend, of which the horizontal signal energy increase is 18.09% and the vertical signal energy increase is 16.12%.