小波变换在判断爆破地震危害中的应用

针对现有的爆破地震危害判据的不足 ,利用小波变换将爆破地震信号在时域、频域上展开 ,根据不同频带的地震波对结构的危害程度取加权系数 ,将地震波信号在各个频带上的主震相的能量按加权系数合成 ,提出了用合成后的能量值作为爆破地震危害程度的判据 ,并结合某核电站的爆破震动监测数据对该判据进行了分析和讨论。该判据综合考虑了爆破地震引起的质点振动速度、振动持续时间、振动频率三种造成爆破地震危害的主要因素 ,与仅用单一的振动速度峰值作为判据相比 ,该判据显得更加科学

APPLICATION OF WAVELET TRANSFORM IN EVALUATION OF BLASTING VIBRATION DAMAGE

To evaluate the blasting vibration damage more accurately,the blasting vibration signals on time frequency domains are extracted by wavelet transform,and the energies of different frequency bands are added up in a given percent The result is used as a new criterion to evaluate the blasting vibration damage The blasting vibration signals used in this study are gotten from blastings at a nuclear power station This criterion involves simultaneously three main factors,i e particle velocity,frequency and duration time As compared with taking alone particle velocity as a criterion,the new criterion is more reasonable