Low-Frequency Characteristics of Vibrations Induced by Transient Unloading of In Situ Stress and Its Influence on Safety of a Deeply Buried Tunnel
Publication: International Journal of Geomechanics
Volume 24, Issue 2
Abstract
High in situ stress is a typical geological characteristic of tunnel excavation in hydropower projects in Southwest China. First, the spectrum characteristics of the vibration induced by the blasting load and transient unloading of in situ stress in the surrounding rock masses were calculated for the full-face millisecond-delay blasting excavation of a deeply buried circular tunnel. Then, the methods of time–energy density and amplitude spectra were employed to analyze the spectral characteristics of the vibration monitored in the excavating and adjacent tunnels at Pubugou, Shenxigou, and Jinping II hydropower stations. Finally, the low-frequency characteristics of vibration induced by transient unloading of in situ stress, hidden in the monitored vibration, were discovered, and their influence on tunnel safety was analyzed. The results showed that under low in situ stress levels (1–10 MPa), the peak value of the vibration induced by the blasting load was larger than that caused by transient unloading of in situ stress, and the difference in the excavating tunnel was notably larger than that in the adjacent tunnel. With an increase in in situ stress (more than 20 MPa), the peak value of vibration induced by transient unloading of in situ stress exceeded that produced by the blasting load in the adjacent tunnel; the same rule was found in the excavating tunnel under high in situ stress (50–70 MPa). A lower frequency and larger amplitude indicate that the vibration induced by transient unloading of in situ stress is much more dangerous than that produced by blasting vibration.
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Data Availability Statement
The data used to support the findings of this study are available from the corresponding author upon request.
Acknowledgments
This work is supported by the National Natural Science Foundation of China (51979152, 52209162), the Science Fund for Distinguished Young Scholars of Hubei Province (2023AFA048), the Educational Commission of Hubei Province of China (T2020005), the Open Foundation of Hubei Key Laboratory of Construction and Management in Hydropower Engineering (2020KSD03), and the Young Top-notch Talent Cultivation Program of Hubei Province. The authors thank all the supporters.
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International Journal of Geomechanics
Volume 24 • Issue 2 • February 2024
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© 2023 American Society of Civil Engineers.
History
Received: Jul 12, 2022
Accepted: Aug 12, 2023
Published online: Dec 13, 2023
Published in print: Feb 1, 2024
Discussion open until: May 13, 2024
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