基于小波变换的爆破地震安全能量分析法的应用研究

根据爆破地震信号具有持时短、变化快等特点,结合工程爆破地震监测资料,利用小波包良好的时频局部化性质,对爆破地震信号的能量分布特征进行了分析,得到了爆破地震信号不同频带上的能量分布。进而,根据爆破地震信号不同频带的特征频率与受控建筑物自振频率之间的关系确定爆破地震对建筑物的影响。最后,通过工程实例说明了该方法比用单一强度因子作为爆破地震的安全判据更加有效。

Study and application of energy analysis method for blasting seismic safety based on wavelet transform

Based on the characteristics of short-duration and abrupt of blasting vibration signals and according to measured data from a practical blast, the features of energy distribution in blasting seismic signals were studied by means of the wavelet packet analysis, which had high resolvability and localization, and energy distribution of blasting seismic signals on different frequency bands was obtained. Based on the relation between characteristic frequency of blasting seismic signals on different frequency bands and natural frequency of controlled structure, the influence of the blasting vibration on the structure could be assessed. A practical engineering example proved that the present method was more effective than the safety-judging standard of single intensity factor for blasting vibration,