Study on Asphalt-Cement Materials for Seismic Isolation Layer of Shield Tunnels
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Volume 34, Issue 11
Abstract
Shield tunnels have been extensively used in many fields and are exposed to the threat of earthquakes. Seismic isolation is an effective anti-seismic method to protect tunnels from earthquake damage. This study investigates asphalt-cement (A-C) materials used as a seismic isolation layer of a shield tunnel by backfill grouting. Both a uniform test and comparative test were conducted to study the grouting properties of A-C materials. The experimental results indicated that an increase in cement content significantly affects the fluidity and consistency of A-C materials. The ultimate compressive strength increased with increasing cement content, and the recommended mass ratio of cement/asphalt for the seismic isolation layer was 50%. Then, a planned shield tunnel crossing hard-soft stratum junction was taken as the research object, and the seismic response of the tunnel lining with different fortified lengths of A-C seismic isolation layer was analyzed by numerical simulation. The calculation results show that the tunnel lining located at the hard-soft stratum junction is vulnerable to damage under seismic action, and the A-C seismic isolation layer can significantly reduce the maximum principal stress of lining near the junction. The reasonable fortified length of the A-C isolation layer for the examined shield tunnel is 3.5 times the tunnel diameter from the stratum junction to both sides.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This project was financially supported by the National Natural Science Foundation of China (No. 51878566), Key R & D Projects in Sichuan Province (No. 2020YFS0294), and Science and Technology Research Project of China Railway (No. K2020G033). The authors are grateful to anonymous reviewers for their valuable and helpful comments.
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 11 • November 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Nov 28, 2021
Accepted: Mar 4, 2022
Published online: Aug 31, 2022
Published in print: Nov 1, 2022
Discussion open until: Jan 31, 2023
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