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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

Postal Subscription Code 80-968

2018 Impact Factor: 1.272

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Front. Struct. Civ. Eng.    2022, Vol. 16 Issue (8) : 1029-1039    https://doi.org/10.1007/s11709-022-0861-x
RESEARCH ARTICLE
Prediction of characteristic blast-induced vibration frequency during underground excavation by using wavelet transform
Tae Un PAK1, Guk Rae JO1, Un Chol HAN2()
1. Faculty of Mining Engineering, Kim Chaek University of Technology, Pyongyang 999093, Democratic People’s Republic of Korea
2. School of Science and Engineering, Kim Chaek University of Technology, Pyongyang 999093, Democratic People’s Republic of Korea
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Abstract

Blast-induced vibration produces a very complex signal, and it is very important to work out environmental problems induced by blasting. In this study, blasting vibration signals were measured during underground excavation in carbonaceous shale by using vibration pickup CB-30 and FFT analyzer AD-3523. Then, wavelet analysis on the measured results was carried out to identify frequency bands reflecting changes of blasting vibration parameters such as vibration velocity and energy in different frequency bands. Frequency characteristics are then discussed in view of blast source distance and charge weight per delay. From analysis of results, it can be found that peak velocity and energy of blasting vibration in frequency band of 62.5–125 Hz were larger than ones in other bands, indicating the similarity to characteristics in the distribution band (31–130 Hz) of main vibration frequency. Most frequency bands were affected by blasting source distance, and the frequency band of 0–62.5 Hz reflected the change of charge weight per delay. By presenting a simplified method to predict main vibration frequency, this research may provide significant reference for future blasting engineering.
Keywords wavelet analysis      blast-induced vibration      frequency characteristics      underground excavation     
Corresponding Author(s): Un Chol HAN   
Just Accepted Date: 17 August 2022   Online First Date: 01 November 2022    Issue Date: 02 December 2022
 Cite this article:   
Tae Un PAK,Guk Rae JO,Un Chol HAN. Prediction of characteristic blast-induced vibration frequency during underground excavation by using wavelet transform[J]. Front. Struct. Civ. Eng., 2022, 16(8): 1029-1039.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-022-0861-x
https://academic.hep.com.cn/fsce/EN/Y2022/V16/I8/1029
Fig.1  Vibration pickup CB-30 and FFT analyzer AD-3523.
Fig.2  Measurement condition and setting state of devices.
signal blasting source distance, R (m) charge weight per delay, Qstep (kg) total charge weight (kg) peak vibration velocity, Vmax (cm/s)
1 2.0 0.2 0.2 5.7471
2 2.0 0.2 0.2 4.1420
3 4.6 0.2 0.6 2.5353
4 5.2 0.4 1.6 4.4471
5 5.2 0.4 1.6 4.2353
6 8.4 0.4 0.4 1.7918
7 8.4 0.2 0.4 1.9524
8 13.9 0.3 0.6 1.1941
9 13.9 0.6 0.6 1.5100
10 14.6 0.6 3.2 1.8770
Tab.1  Measuring data of blasting vibration
Fig.3  Waveform of measured blasting vibration. (a) Signal 1; (b) signal 2; (c) signal 3; (d) signal 4; (e) signal 5; (f) signal 6; (g) signal 7; (h) signal 8; (i) signal 9; (j) signal 10.
Fig.4  Blasting vibration contents of six decomposed frequency bands: (a) blasting vibration signal; (b) 0–15.625 Hz frequency band content; (c) 15.625–31.25 Hz frequency band content; (d) 31.25–62.5 Hz frequency band content; (e) 62.5–125 Hz frequency band content; (f) 125–250 Hz frequency band content; (g) 250–500 Hz frequency band content.
Fig.5  Peak vibration velocity of blasting vibration components in each frequency band.
Fig.6  Energy of blasting vibration components in each frequency band.
Fig.7  R−Vmax diagram of blasting vibration signal components in each frequency band.
Fig.8  R−E diagram of blasting vibration signal components in each frequency band.
Fig.9  Qstep−Vmax diagram of blasting vibration signal components in each frequency band.
Fig.10  Qstep−E diagram of blasting vibration signal components in each frequency band.
frequency band (Hz) kj αj characteristic equation
0–15.625 1.9345 0.6491 v1=1.9345 (Q3R)0.6491
15.625–31.25 1.1966 0.2652 v2=1.1966 (Q3R)0.2652
31.25–62.5 1.7815 0.3251 v3=1.7815 (Q3R)0.3251
62.5–125 5.8268 0.6005 v4=5.8268 (Q3R)0.6005
125–250 5.3260 0.8898 v5=5.326 (Q3R)0.8898
250–500 2.6116 0.7932 v6=2.6116 (Q3R)0.7932
Tab.2  Damping coefficients and characteristic equation of blasting vibration components in each frequency band
Fig.11  Normalized wavelet coefficients. (a) 0–15.625 Hz; (b) 15.625–31.25 Hz; (c) 31.25–62.5 Hz; (d) 62.5–125 Hz; (e) 125–250 Hz; (f) 250–500 Hz.
Fig.12  Comparisons between predicted and measured waveforms. (a) signal 2; (b) signal 3; (c) signal 4; (d) signal 5; (e) signal 6; (f) signal 7; (g) signal 8; (h) signal 9; (i) signal 10.
Fig.13  Comparative analysis of predicted and measured values of main frequency band.
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