Abstract
For the smooth blasting method, the straight parallel hole cutting method, single wedge hole cutting method and double wedge hole cutting method have been devised. Corresponding to the devised cutting methods, the blasting test have been carried out in site. By the blasting vibration monitor technology, the blasting effect and peak blasting vibration velocity have been considered and compared. From the points of blasting footage, half hole ratio of the peripheral hole, rock slag throwing distance and the homogenization degree of rock slag, the blasting effect has been assessed separately. In advance, for straight parallel hole cutting, there is a rather higher ratio in the low frequency band area, the Power Spectral Density (PSD) mainly concentrated in the range of 0-100 Hz. However, for the wedge hole cutting, the PSD mainly ranges from 0 to 800 Hz, concentrated in a higher frequency band area. Meantime, for straight parallel hole cutting, the overall energy distribution is in the low frequency part, and the distribution difference is a bit large. For the single wedge hole cutting, about 25 % of the energy in the second layer is concentrated in the range of 1000-2000 Hz. In the third layer, about 20 % of the energy is concentrated in the range of 1500-2000 Hz. Furthermore, for the double wedge hole cutting, the energy distribution is basically uniform, and there is equivalent vibration energy distribution in each frequency band. In the second layer, about 50 % of the energy is concentrated in the high frequency part, that is in the 1000-2000 Hz. Even in the range of 1750-2000 Hz, there is about 20% of the energy still distributed here.
Highlights
Drilling and blasting is the main excavation method, which is highly applied in the construction of highway, railway, hydraulic tunnel and underground engineering, etc
Wavelet transform has been widely used in the blasting vibration signals processing because of its high resolution and adaptability, as well as its ability to characterize the local property of WAVELET PACKET ANALYSIS ON BLASTING VIBRATION SIGNAL UNDER DIFFERENT CUTTING METHOD
For the double wedge hole cutting, the Power Spectral Density (PSD) mainly concentrated in the higher frequency range, from 0 to 800 Hz
Summary
Drilling and blasting is the main excavation method, which is highly applied in the construction of highway, railway, hydraulic tunnel and underground engineering, etc. Wavelet analysis, which can represent time-frequency information, has gradually become the main method to process blasting vibration signals. Wavelet transform has been widely used in the blasting vibration signals processing because of its high resolution and adaptability, as well as its ability to characterize the local property of WAVELET PACKET ANALYSIS ON BLASTING VIBRATION SIGNAL UNDER DIFFERENT CUTTING METHOD. The blasting vibration signal at the designated point of frozen rock wall has been obtained through the shaft blasting test with db wavelet basis [18], and the energy distribution of different frequency bands of has been analyzed. Based on the measured blasting vibration data in situ, the decomposition and reconstruction of wavelet packet method has been applied here to discuss the propagation, attenuation and distribution of the seismic waves from the perspective point of energy. From the views of blasting footage, half hole ratio of the peripheral hole, rock slag throwing distance and the homogenization degree of rock slag, the blasting effect has been assessed separately
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