1.Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Yangtze River Scientific Research Institute,
Wuhan 430010,China;
2.School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China
Penetrating presplit cracks induced by presplit blasting have a great influence on spectrum distribution characteristics and energy distribution of the main blast hole’s blasting.The excavation blasting tests were conducted at Baihetan hydropower station dam section’s rock high side slope on the left bank side of Jingsha River.Based on the data obtained with the excavation blasting tests,the vibration signals’ power spectral density and energy spectral density of the main blast hole’s blasting and presplit blasting were gained using the wavelet packet analysis.The results showed that the blasting vibration energy focuses on the range of 0-40 Hz,and the energy distribution is extremely uneven; there are several main vibration frequency bands; the main vibration frequency bands of presplit holes blasting are distributed more widely than those of the main blast holes blasting be at different measured points in one excavation blasting test; compared with presplit holes blasting,the power spectral density and energy spectral density of the main blast holes blasting are centralized into main vibration frequency bands with lower frequencies; the pre-splitting crack induced by presplit blasting can prevent the energy transmission of the main blasting,and there is an effect of higher frequency filtering; the lower-frequency vibration stress waves with longer wavelength can better pass through pre-splitting cracks.
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