Dynamic Stress Concentration and Particle Velocity Response of a Composite Lining Tunnel with Imperfect Interfaces Subjected to Blasting P Waves
Publication: International Journal of Geomechanics
Volume 23, Issue 11
Abstract
The dynamic response of a composite lining tunnel with an isolation layer under blast-induced cylindrical P waves is investigated by using the wavefunction expansion method. The spring model is introduced to simulate the imperfect interfaces between the structural layers of tunnels. Numerical calculations are carried out based on the Xianglu Mountain Tunnel in Southwest China to illustrate the influence of the source-to-tunnel distance, the degree of interface imperfection, and the shear modulus and thickness of the isolation layer on the dynamic stress concentration factor (DSCF), the radial velocity scaling factor (RVSF), and the hoop velocity scaling factor (HVSF) of the final lining. It is concluded that dynamic stress and peak particle velocity in the final lining are strongly affected by the source location, especially under the condition of a small source-to-tunnel distance and a relatively low incident frequency. The DSCF, RVSF, and HVSF for blasting P waves, the frequency of which is below 200 Hz, agree with the corresponding results for far-field plane P waves if the source-to-tunnel distance surpasses 50 times the inner diameter of the tunnel. The interface imperfection tends to weaken the DSCF in the final lining, and its effect on RVSF and HVSF is frequency-dependent. The isolation layer can significantly reduce the dynamic stress and particle velocity response in the final lining.
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Data Availability Statement
All data, models, and codes that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 52078184), the University Natural Science Research Project of Anhui Province (Grant No. 2022AH020027), the Fundamental Research Funds for the Central Universities (Grant No. B220203030), the National Natural Science Foundation of China (Grant No. 52208361), and the Natural Science Foundation of Jiangsu Province (Grant No. BK20220638).
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Published In
International Journal of Geomechanics
Volume 23 • Issue 11 • November 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Aug 28, 2022
Accepted: May 21, 2023
Published online: Aug 31, 2023
Published in print: Nov 1, 2023
Discussion open until: Jan 31, 2024
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