Construction and application of near zone vibration waveform of tunnel blast under condition of double-free face

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (1) : 52-59.

GONG Min1, CAO Zhenyang1, SHI Facai1, WU Haojun1, WU Xiaodong1, ZHOU Shijun2

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Abstract

In recent years, the composite calculation of millisecond vibration based on single-hole blasting vibration data has been a research focus. To solve the problem of waveform calculation after the formation of the second facing surface, an on-site blasting test was designed to obtain a limited number of single-hole waveforms under double face, with Liantang small clear distance tunnel as background. The dominant frequency bands of the measured waveforms were analyzed by wavelet packet transform and single-hole waveforms were decomposed into multiple wavelets of dominant frequency bands. The functions were obtained by fitting between the charge of blast hole, the distance from burst centers and the maximum vibration velocity in each dominant frequency band. Wavelets of all holes were gotten in different frequency bands with the functions and each hole’s single hole waveform was constructed by superimposing the wavelets of all frequency bands. With the change of charge quantity and blasting center distance, calculated to get vibration waveforms at different delay intervals, then obtained the optimal delay interval. Results: The calculated synthetic waveforms fit well with measured waveforms in terms of frequency composition and waveform trend, the peak error of each vibration velocity is less than 0.3 cm/s; the delay interval of peripheral hole millisecond blasting for the best vibration reduction effect is 6~7 ms, and the field application has a good effect.

Key words

double-free-face / dominant frequency band / waveform structure / linear superposition / optimal delay interval

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GONG Min1, CAO Zhenyang1, SHI Facai1, WU Haojun1, WU Xiaodong1, ZHOU Shijun2. Construction and application of near zone vibration waveform of tunnel blast under condition of double-free face[J]. Journal of Vibration and Shock, 2022, 41(1): 52-59

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