Mechanical Characteristics of Large-Diameter Shield Tunnel Segment Structure under High Water Pressure

SU Ang; FENG Kun; HE Chuan; LIANG Kun; GUO Wenqi

doi:10.3969/j.issn.0258-2724.20240419

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Journal of Southwest Jiaotong University > 2025 >

SU Ang, FENG Kun, HE Chuan, LIANG Kun, GUO Wenqi. Mechanical Characteristics of Large-Diameter Shield Tunnel Segment Structure under High Water Pressure[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20240419

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SU Ang, FENG Kun, HE Chuan, LIANG Kun, GUO Wenqi. Mechanical Characteristics of Large-Diameter Shield Tunnel Segment Structure under High Water Pressure[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20240419

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Mechanical Characteristics of Large-Diameter Shield Tunnel Segment Structure under High Water Pressure

doi: 10.3969/j.issn.0258-2724.20240419

SU Ang^{1, 2
,},
FENG Kun^{2
,
,},
HE Chuan²,
LIANG Kun^{2, 3},
GUO Wenqi²

1.
Jiangsu Provincial Transportation Engineering Construction Bureau, Nanjing 210001, China
2.
Key Laboratory of Transportation Tunnel Engineering, Southwest Jiaotong University, Ministry of Education, Chengdu 610031, China
3.
School of Civil Engineering, The University of Hong Kong, Hong Kong 999077, China

Received Date: 02 Sep 2024
Rev Recd Date: 12 Nov 2024

Available Online: 12 Jan 2026

Abstract

Abstract

To investigate the mechanical characteristics of large-diameter shield tunnel segment structures under ultimate loads, a multifunctional shield tunnel structure loading device was used to conduct a prototype loading failure test on the shield tunnel segment structure of the Sutong gas-insulated metal-enclosed transmission line (GIL) utility tunnel project. The mechanical response laws of deformation, internal force, joint deformation, bolt and steel bar strain of the segment structure under ultimate load were analyzed. Based on the crack morphology, the failure characteristics and mechanisms of the segment structure were revealed. The results show that the deformation of the segment structure presents a horizontal duck egg shape, the bending moment presents a butterfly shape, and the axial force presents a circular shape. The maximum single point change rate is 10.3‰, the maximum positive bending moment is 3896 kN•m, and the maximum axial force is 17099.28 kN. The maximum bolt strain is 1871 με, far less than the yield strain, and the maximum steel bar strain is 2213 με, exceeding its yield strain. The safety margin for the deformation indicator of the segment structure is between 0.92 and 1.72, while for the strength indicator, it is between 0.10 and 0.16. The strength indicator reaches the ultimate failure value before the deformation indicator. Reinforcement yielding or the main crack penetration is recommended as the judgment criterion of the ultimate limit state for the normal serviceability of the segment structure. Cracks of the segment structure first appear in the middle of the segment B3. When the load is 1778.4 kN, multiple cracks penetrate through the inner and outer arc surfaces of the arch crown and arch bottom, with the maximum widths of the cracks on the inner and outer arc surfaces reaching 4.5 mm and 11.5 mm, respectively. The steel bar of the segment B3 reaches the yield condition, and the segment structure is damaged due to local instability.
- shield tunnel,
- high water pressure,
- large diameter,
- staggered assembled segment structure,
- characteristics,
- prototype loading test

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References(25)

References

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Mechanical Characteristics of Large-Diameter Shield Tunnel Segment Structure under High Water Pressure

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Mechanical Characteristics of Large-Diameter Shield Tunnel Segment Structure under High Water Pressure

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