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为研究不同爆破参量对爆破振动信号能量分布的影响,采用小波包分析技术对不同爆破参量下某矿山的爆破振动信号进行了小波包能量分析,结果表明,随着爆心距的增加,0~15.6 Hz爆破振动信号的能量占总能量比例呈上升趋势,增幅为45.88%;15.7~62.5Hz的能量占总能量比例明显降低,降幅达56.7%。同样的,随着最大单响药量和高程的增加,0~15.6 Hz爆破振动信号的能量占总能量比例也呈上升趋势,增幅分别为33.86%和26.33%;15.7~62.5Hz的能量占总能量比例明显降低,降幅分别为50.64%和39.76%。随着爆心距、最大单响药量及高程的增加,爆破振动信号的主振频带有向低频发展的趋势。而该频率接近该矿山边坡的固有频率,容易发生共振,导致边坡失稳。
In order to study the influence of different blasting parameters on energy distribution of blasting vibration signal, wavelet packet analysis was used to analyze the energy of blasting vibration of a mine under different blasting parameters. The results show that with the increase of blasting center distance, 0 ~ 15.6 The energy of blasting vibration signal accounted for 45.88% of the total energy; the proportion of energy from 15.7 to 62.5Hz in total energy decreased obviously, dropping by 56.7%. Similarly, with the increase of the maximum single-bolus dose and elevation, the energy of blasting vibration signals at 0 ~ 15.6 Hz accounted for 33.86% and 26.33% of the total energy, respectively. The energy of 15.7 ~ 62.5Hz accounted for Energy ratio decreased significantly, a decrease of 50.64% and 39.76% respectively. With the increase of explosive center distance, the maximum single-bolus dose and elevation, the main vibration frequency band of blasting vibration signal tends to develop towards low frequency. The frequency is close to the natural frequency of the mine slope, prone to resonance, leading to slope instability.