Stability Analysis of Box Tunnel Working Face under Non-Uniform Support Pressure
Source abstract
Abstract
For rectangular section tunnel construction, soil bin pressure fluctuates under biaxial emergence conditions. Support pressure is difficult to uniformly distribute, and it can easily cause instability of the tunneling face. The Silo-wedge model is used to perform horizontal strip splitting of parts of the soil at risk for instability under unsupported conditions. In the ultimate equilibrium analysis, the strength discounting method is introduced, a new expression for the safety factor is derived by combining the horizontal strip splitting equilibrium equations, and the safety factor is solved numerically. When the opening range is greater than 0.75 and the effective internal friction angle of the soil is less than 25°, the safety coefficient is less than 1, and destabilization damage is likely to occur. The field application of a box tunnel project in Suzhou demonstrates that the research results have good engineering applicability to the issue.
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Research context
OpenAlex topics: Geotechnical Engineering and Analysis · Geotechnical Engineering and Soil Stabilization · Geotechnical Engineering and Underground Structures
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Rail Transportation, Soochow University, Suzhou 215131, China
Research Center of Coastal and Urban Geotechnical Engineering, Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China
Beijing Urban Construction Design and Development Group Co., Ltd., Beijing 100013, China
Funding
National Natural Science Foundation of China · Power China Huadong Engineering Corporation Limited · Key R&D Program of Zhejiang Province
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