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| Study on the Energy Spectrum Characteristics of Bunch-Holes Blasting across Joint by Wavelet Packets |
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Received:April 08, 2024
Revised:July 15, 2024
Accepted:August 27, 2024
Published Online:August 05, 2025
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| DOI： |
| KeyWord:bunch-holes；blasting stress wave；testing；vibration wave signal；wavelet packet； energy spectrum |
| Author | Institution |
| Chen He |
BGRIMM Technology Group Co.,Ltd. |
| Xiong Changran |
BGRIMM Technology Group Co.,Ltd. |
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| Abstract: |
| Blasting vibration signal is a typical non-stationary signal that contains rich information about the blasting process. Due to its unique borehole configuration, bunch-holes has different blasting characteristics compared to equivalent large hole. The analysis of blasting vibration signals is mainly based on time-frequency analysis, lacking research on the vibration signals of bunch-holes blasting from energy spectrum. Vibration signals of bunch-holes and equivalent large hole blasting across joints were obtained through blasting tests. Wavelet packet analysis was used to study the time-frequency and energy spectrum distribution and attenuation characteristics of these signals, revealing the inherent mechanism of energy utilization in bunch-holes blasting. The research results indicate that the energy of bunch-holes is mainly distributed in lower frequency bands with small frequency band interval. The attenuation of bunch-holes stress wave across joints is relatively weak. The total energy of equivalent large hole blasting stress wave decreases by 57.53% across 4mm joints, while the total energy of bunch-holes blasting stress wave across 4mm joints remains basically constant which is 1.65 times that of equivalent large hole. |
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