Acoustic Tunnel Lining Void Detection: Modeling and Instrument System Development

The detachment of railway tunnel lining constitutes a grave danger to train operation safety and drastically curtails the tunnel’s service life. This study endeavors to efficiently detect the void defects in railway tunnel lining by creating a finite element model of tunnel lining structures. Utiliz...

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Bibliographic Details
Published in:Processes 2024-11, Vol.12 (12), p.2651
Main Authors: Tang, Luxin, Zeng, Jinbin, Chen, Chuixin, Huang, Jian, Zhou, Shuxing, Wang, Li, Zhang, Defu, Wu, Weibin, Gao, Ting
Format: Article
Language:English
Subjects:
Accuracy
Acoustic emission testing
Acoustic excitation
Acoustic propagation
Acoustic waves
Acoustics
Concrete
Defects
Deformation
Efficiency
Extreme values
Finite element method
Methods
Portable equipment
Propagation
Railway engineering
Railway tunnels
Rare earth elements
Service life
Time domain analysis
Tunnel linings
Unmanned aerial vehicles
Wave propagation
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Summary:The detachment of railway tunnel lining constitutes a grave danger to train operation safety and drastically curtails the tunnel’s service life. This study endeavors to efficiently detect the void defects in railway tunnel lining by creating a finite element model of tunnel lining structures. Utilizing this model, the study simulates the nonlinear acoustic wave propagation cloud maps for three representative tunnel lining structures: void-free, air void, and water void. This facilitates a thorough examination of the acoustic signal characteristics in the wavefield, time domain, and frequency domain. To satisfy the precision and efficiency demands of tunnel lining void detection, this study has devised and developed a portable acoustic detector that incorporates automatic analysis and processing capabilities and is furnished with a high-performance rare-earth magneto-strictive acoustic excitation device. This detection system can swiftly detect and assess typical void defects in tunnel lining. To further validate the effectiveness of this system, this study conducted lining defect detection in the Pingdao Railway Tunnel in the eastern Qinling Mountains. The test results show that the detection rate of this system for both air-filled and water-filled voids with a width of 1 m reached 100%, demonstrating its extremely high application value.
ISSN:2227-9717
2227-9717
DOI:10.3390/pr12122651