Influence On Surface By Tunnel Excavation Blasting Vibration Based On Wavelet Packet Analysis

At present,there is growing concern in the construction of blasting vibration effect testing,but for the collection of blasting vibration signals,many deficiencies in the data analysis still exist.Blasting vibration essentially is a non-stationary random process,and the theoretical basis of traditional Fourier transformation is not consistent with the process.After complex geotechnical media dissemination,blasting seismic waves contain various frequency components of the interferential wave,because of stacking of the interferential wave,blasting vibration Analysis to the frequency characteristics of signals have became very difficult.The application of the traditional Fourier transformation is unable to get the accurate time-frequency characteristics of blasting vibration signals,for this reason,the application of new analytical methods become necessary,the appearance of wavelet analysis were just fill the inadequacy of signals time-frequency analysis methods in the current.In this paper,on the basis of introduction of the theory for Fourier analysis and wavelet analysis,Fourier transformation method and wavelet analysis method are used to deal with signals.