Analysis of Deformation Characteristics and Failure Mechanism of Interbedded Surrounding Rock Tunnels Based on Principal Stress Difference
Publication: International Journal of Geomechanics
Volume 24, Issue 9
Abstract
After excavation of tunnels in interbedded surrounding rock, accidents such as rock peeling and arch crown collapse are prone to happen. In response to this issue, we first established an analysis model for the excavation of the interbedded surrounding rock tunnel through theoretical analysis, proposed corresponding failure criteria, and analyzed the reasons for the easy failure of the interbedded tunnel support structure based on the concept of principal stress difference. We also created interfaces in FLAC3D (version 6.0) software to restore the actual interbedded interface, verifying the effectiveness of principal stress difference in analyzing the deformation characteristics of the tunnel. Then, the instability forms of the interbedded surrounding rock tunnel were divided into two types, and effective support methods for the corresponding instability forms were proposed. Finally, based on the analysis results of the study, support was provided for the collapsed tunnel on site. A grouting large pipe shed was put to innovative use to support the tunnel arch waist, stabilizing the surrounding rock that is prone to shear slip and fracture at the upper part of the arch waist. The results indicate that the surrounding rock control effect is good. This study has a good reference value for on-site rapid construction and support design, and is of great significance for the instability prevention and control of interbedded surrounding rock tunnels.
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Data Availability Statement
All data and models generated or used during the study are available from the corresponding author by request, including laboratory data results.
Acknowledgments
The authors gratefully acknowledge the financial support by the Major Science and Technology Special Project of Yunnan Province (202102AF080001), the Yunnan Innovation Team (202105AE160023), and the Yunnan Major Scientific and Technological Projects (202202AG050014).
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Published In
International Journal of Geomechanics
Volume 24 • Issue 9 • September 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Aug 21, 2023
Accepted: Mar 18, 2024
Published online: Jul 9, 2024
Published in print: Sep 1, 2024
Discussion open until: Dec 9, 2024
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