Vibration characteristics analysis of the metro tunnel subarea blasting based on wavelet packet technique

被引：0
|
作者：
Chen J. [1 ]
Qiu W. [1 ]
Zhao X. [1 ]
Wang H. [2 ]
机构：
[1] Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu
[2] Key Laboratory of Mine Disaster Prevention and Control, Shandong University of Science & Technology, Qingdao
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2022年 / 41卷 / 06期
关键词：
Blasting vibration; Energy spectrum; Main frequency band; Subarea; Tunnel; Wavelet packet;
D O I：
10.13465/j.cnki.jvs.2022.06.028
中图分类号：
学科分类号：
摘要：
Wavelet packet analysis is widely used in the study of amplitude-frequency characteristics of blasting vibration signals, and is helpful to analyze the propagation and control of blasting vibration. Based on the divisional blasting vibration test in the Qingdao Metro overlapping tunnel, the monitoring data of blasting vibrations were obtained. The frequency and energy distribution characteristics of tunnel blasting vibration signals were analysed by using wavelet packet technology. The results show that the diversity of blasting vibration characteristics are caused by the number of free surfaces and the location of the measurement area. The main frequency of blasting vibration in cutting area is smaller than that in auxiliary area. With the increase of horizontal distance, the main frequency band in front of the blasting face (i.e. the tunnel section not yet excavated) generally moves to high frequency, and the proportion of high frequency energy increases. At the back of the working face, the main frequency band moves to low frequency with the increase of horizontal distance, and the proportion of low frequency energy increases. The varying trend of blasting vibration energy with the change of distance in auxiliary area and cutting area is basically the same, but the attenuation rate of energy with the change of distance is different. Considering the frequency and energy factors, constructive suggestions were put forward on the safety protection of the existing tunnel so as to ensure the safety and stability of the tunnel. © 2022, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：222 / 228and255
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