【摘要】 为了研究爆破地震波振动分量的传播规律,在微风化花岗岩石场地进行了孔径为76mm,孔深为5mm的单孔和单段多孔爆破试验,获得该场地爆破地震波加速度衰减规律,加速度衰减系数为k=3 698,α=2.046,并研究出该场地基频范围为48Hz~74Hz。采用小波包技术对爆破地震波测试信号进行时频特征量提取,分析试验所测得爆破地震波不同频带下小波包系数的衰减规律。在此基础上通过研究场地介质对爆破振动分量的动态响应衰减作用,分析形成爆破地震波多频带特征的机理。更多还原

【Abstract】 In order to study propagating law of blasting seismic wave vibration,blasting experiments are made in a granite site weakly weathered.The acceleration attenuation of the blasting seismic wave in the site is measured,the deep hole for blast is of 76mm in diameter and 5m in depth.The acceleration attenuation coefficients are k=3698andα=2.046,the base frequency range of the site is found to be 48~74Hz.With wavelet packet analysis,the blasting seismic wave time-frequency characteristics are extracted,and the attenuation law of the corresponding wavelet packet coefficients within different frequency bands vs the scaled distance is studied.Through analyzing the attenuation effect of the site medium on the dynamic response of the blasting seismic wave,the mechanism to form the multi-frequency-band feature of the blasting seismic wave is analyzed.更多还原