Analysis of Grouting Stability in Composite Stratum Tunnels with Discontinuity Layout Optimization
Publication: International Journal of Geomechanics
Volume 24, Issue 11
Abstract
When constructing tunnels in composite strata of soft and hard rock combinations, the disturbance during construction often leads to the collapse and instability of weak strata. Pregrouting is commonly employed in tunnel construction to reinforce the weak surrounding rock, aiming to achieve stable excavation faces. The assessment of excavation face stability and the selection of grouting parameters are crucial for the safe construction of tunnels in composite strata. This paper utilizes the recently proposed discontinuity layout optimization (DLO) method. Taking the tunnel at the Shilaoren Bathing Beach Station in Qingdao as an example, the stability of the excavation face is quantitatively evaluated using a safety factor. Furthermore, the paper explores the influence of the position of the composite stratum boundary, friction angle, cohesive strength, and grouting parameters on the stability of the tunnel excavation face. Simultaneously, the paper fits the grouting parameters and safety factor curves under different geological parameters, aiding construction personnel in choosing reasonable grouting parameters.
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Data Availability Statement
Some or all data, models, or codes generated or used during the study are available from the corresponding author upon request. All data used to generate figures and tables in this paper are available.
Acknowledgments
This study was supported by the National Natural Science Foundation of China (No. 52378402), the Project Funded by Shandong Hi-Speed Group “Kilometer-Scale Directional Drilling-Injection Integration Equipment and Far-Field Targeted Disaster Disposal Technology”, the State Key Laboratory of Precision Blasting and Hubei Key Laboratory of Blasting Engineering of Jianghan University (No. PBSKL2022C03), the Shenzhen Collaborative Innovation and Technology Project Robot Equipment Project (No. GJHZ20200731095006019), the Shandong Province Natural Science Foundation (Nos. ZR202211100077 and ZR2022QE021), the Key Technologies and Integrated Applications of Intelligent Enhancement of Highway Tunnel Construction Equipment and Robot Equipment (No. SDGS-YJYKJ-2021-18), the Youth Innovation Project of Shandong Higher College (No. 2022KJ037), and the Research on the Intelligent Control Mechanism of Moisture Content and Strength Maintenance Technology for Silty Clay Subgrade in the Lower Yellow River Basin (No. 52178429). Great appreciation goes to the editorial board and the reviewers of this paper.
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Published In
International Journal of Geomechanics
Volume 24 • Issue 11 • November 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Dec 17, 2023
Accepted: May 20, 2024
Published online: Sep 13, 2024
Published in print: Nov 1, 2024
Discussion open until: Feb 13, 2025
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