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Optimization of excavation method for large-section metro station tunnel: a case study
Haiyun Huang1, Wenge Qiu2,3
1Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, School of Civil Engineering, Southwest Jiaotong University, Chengdu, 610031, China.
Scientific Reports
|July 3, 2026
Summary
Optimizing large-section metro tunnel excavation, the optimized three-bench (OTB) method proved efficient and stable. Eliminating the central pillar is feasible with proper assessment, balancing stability and construction efficiency.
Area of Science:
- Geotechnical Engineering
- Tunneling Engineering
- Civil Engineering
Background:
- Large-section metro station tunnels present excavation challenges.
- Optimizing excavation methods is crucial for safety and efficiency.
- The Baijusi Station Tunnel case study focuses on sandstone excavation.
Purpose of the Study:
- To optimize excavation methods for large-section metro station tunnels.
- To compare the Double Side Drift (DSD) and Optimized Three-Bench (OTB) methods.
- To verify the feasibility of eliminating the central pillar in OTB excavation.
Main Methods:
- Numerical simulations using the Hoek-Brown criterion.
- Comparative analysis of DSD and OTB methods.
- Field monitoring of deformation, support stress, and microseismic events.
Main Results:
- OTB method showed comparable stability to DSD but improved efficiency and workspace.
- Field monitoring confirmed acceptable deformation and support responses for OTB.
- Microseismic data supported numerical predictions of rock mass behavior.
Conclusions:
- Eliminating the central pillar in OTB excavation is feasible under specific conditions.
- The OTB method offers a balance between tunnel stability and construction efficiency.
- Numerical assessment, trial verification, and field monitoring are key to successful implementation.
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