【摘要】 为了分析自由面数量对爆破地震效应的影响,进行了现场试验。基于实测数据,利用AOK时频分布与小波分析相结合的方法,以质点振动峰值速度、主频、频带能量分布及频带能量持续时间为指标,对不同自由面下爆破地震波特性进行了详细的解读。结果表明:随着自由面数量的增加,爆破地震波质点振动速度峰值降低,主频增加且主频带变宽,峰值能量降低,低频部分占总能量的比例降低,且持续时间变短。因此可从能量的角度认为,自由面越充分爆破地震的危害效应越低,越有利于结构的安全。更多还原

【Abstract】 In order to analyze the influence of number of free surface on blasting vibration effects,the field test was carried out.Based on the measured data,with the method of AOK time-frequency distribution and wavelet analysis,by using the particle peak vibration value,dominant frequency and distribution and duration of frequency band energy as criteria,the characteristics of blasting seismic wave of different free surface conditions were interpreted.Results show that with the increasing of number of free surface,the particle peak vibration velocity value decreased,the dominant frequency increased and the dominant frequency band became wider.Meanwhile,the energy of low frequency part decreased.Therefore,on the view of energy,the higher number of free surfaces,the smaller harm effects of blasting vibration and the safer structure would be obtained.更多还原