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| Thermal characteristics of a lining of a large diameter shield tunnel under hydrocarbon curve |
| YAN Zhiguo1,2, WANG Zirui1, SHEN Yi1,2*, LIU Kang1
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1. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China;
2. State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China |
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Abstract Based on a large-diameter tunnel in Jinan, a full-scale numerical analyze model was performed to analyze the temperature field distribution, structural deformation and internal force distribution of the shield tunnel in fire. A thermal-mechanical coupling analysis method for shield tunnel lining structures was proposed. The results showed that the temperature of the inner heating surface area was significantly higher than the outer surface during fire, 300 mm part of the lining from the inner heating surface was not affected by fire; The lining expanded due to the heating in fire; The deformation of the vault and the bottom gradually decreased, the horizontal deformation of the arch waist continued to increase, some segment joints were significantly opened under the effect of fire. The stress of lining entered the yield state from the heating surface, while stress redistribution developed and connection bolts partially yield; The axial force of overall structure decreased and the bending moment increased dramatically, the bending moment of the arch waist even doubled compared with before.
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Published: 28 June 2024
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