关键词: 爆破振动, 深孔爆破, 高程效应, 鞭梢效应, 精确延时

Abstract: Engineering blasting plays an important role in the process of national economic construction in China,but blasting vibration,as the first harmful effect of blasting,is a problem that can not be ignored.In order to study the "elevation effect","whiplash effect" and the energy distribution characteristics of blasting vibration wave in deep-hole controlled blasting in open-pit mine,a method for analyzing blasting vibration effect based on the precise delay of electronic detonator and EEMD-HHT signal analysis technology is proposed in this paper,relying on the deep-hole controlled blasting project in Xingguang Open-pit Mine and through field blasting test.The test and analysis results show that the blasting vibration velocity shows attenuation trend,and there is elevation amplification effect with obvious directivity.The amplification coefficient is vertical (Z direction)> radial (X direction) > tangential (Y direction).At the same elevation,the phenomenon of "whiplash effect" is obvious,which shows that the peak vibration velocity of rock mass near the outer edge of the step is greater than that at the foot of the inner edge slope.The dominant frequency band of blasting vibration signal energy is distributed in 10~50 Hz,and mainly in low frequency band.The energy of blasting vibration wave is vertical (Z direction)> tangential (Y direction)> radial (X direction).Through the study on the vibration effect of deep-hole controlled blasting in open-pit mine,the influence of blasting vibration on rock mass disturbance is reduced,and the slope rock mass is stable,the outline is clear and the broken rock mass is uniform after blasting,which provides reference for similar engineering.

Key words: blasting vibration,deep hole blasting,elevation effect,whiplash effect,accurate delay