【摘要】 采用震波叠加模拟法确定合理的微差延期时间,关键在于能否获取组成实测微差爆破震波的分段震波。基于小波变换的微差爆破震动信号分离法能较好地解决上述问题。首先,利用基于小波分析的时-能密度法,通过从实测爆破震动信号中识别出各段雷管实际的起爆时刻点,得到了爆破中所用雷管的实际延期时间。其次,利用信号时-频转换技术,从实测微差爆破震动信号中分离出各分段震波。最后,通过比较各分段震波在不同延期时间下的叠加效果,可以得到微差爆破的较优微差延期时间。以某地下工程爆破震动信号进行分析为例,对本方法的有效性作了检验。更多还原

【Abstract】 The key to ascertaining reasonable delay time interval by the means of seismic waves superposition effect is to get each sub-signal from measured millisecond blast vibration signal.The separating means of millisecond blast vibration signal based on wavelet transform can solve successfully the problem mentioned above.Firstly,the authors make use of time-energy density analysis based on wavelet transform and get the real delay time by identifying the blast moment of short-delay detonators.Secondly,every sub-signal is separated from measured millisecond blast vibration signal by time-frequency domain transform techniques.Lastly,the optimized delay time interval is obtained by comparing the superposition effect of sub-signal in different delay time interval.The effectiveness of the proposed method is verified with time-energy density analysis of millisecond blasting vibration signals in a underground engineering.更多还原