Prediction of characteristic blast-induced vibration frequency during underground excavation by using wavelet transform  

作　　者：Tae Un PAK Guk Rae JO Un Chol HAN 

机构地区：[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

出　　处：《Frontiers of Structural and Civil Engineering》2022年第8期1029-1039,共11页结构与土木工程前沿（英文版）

基　　金：The authors are grateful for the financial support received from the National Science and Technical Development Foundation of DPRK Korea(No.24-210301).

摘　　要：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.

关 键 词：wavelet analysis blast-induced vibration frequency characteristics underground excavation 

分 类 号：TU746.5[建筑科学—建筑技术科学]