Study Of Tunnel Excavation Blasting Seismic Characteristics And Prediction Method

The prediction and control of blasting hazard is always an important subject in engineering blasting field, especially the hazard of blasting seismic is paid more attention. In this paper, according to the safety monitoring of tunnel excavation blasting, in the project of Tai'an pumped storage power station, on the basis of theoretical analysis, and associated with vast field measured data, the travel rules of tunnel excavation blasting seismic, spectrum characteristics and hazard prediction methods are analysed.Firstly, various factors that affect the transmission and attenuation of blasting seismic are analysed in theory. Then according to the regression analysis on the field data, the parameter value K, a in the empirical equation which is fit for the area are defined. The rule of seismic transmission in excavation blasting is thus got. Secondly, with the help of Wavelet analysis the measured data are studied and compared with the results of Fourier analysis, spectrum characteristic of the blasting seismic in this sector is then attained. Finally, a BP neutral network model which is fit for the prediction of tunnel blasting seismic is established, according to the prediction of particle velocity of blasting seismic, the tunnel excavation blasting is supervised to go smoothly. On the basis of the comparison with the regression results of measured data, the prediction with BP neutral network is proved to be a feasible method in the effect control of tunnel excavation blasting.