Analytical algorithms of compressive bending capacity of bolted circumferential joint in metro shield tunnels

Xiaojing GAO, Pengfei LI, Mingju ZHANG, Haifeng WANG, Zenghui LIU, Ziqi JIA

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PDF(6311 KB)
Front. Struct. Civ. Eng. ›› 2023, Vol. 17 ›› Issue (6) : 901-914. DOI: 10.1007/s11709-023-0915-8
RESEARCH ARTICLE
RESEARCH ARTICLE

Analytical algorithms of compressive bending capacity of bolted circumferential joint in metro shield tunnels

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Abstract

The integrity and bearing capacity of segment joints in shield tunnels are associated closely with the mechanical properties of the joints. This study focuses on the mechanical characteristics and mechanism of a bolted circumferential joint during the entire bearing process. Simplified analytical algorithms for four stress stages are established to describe the bearing behaviors of the joint under a compressive bending load. A height adjustment coefficient, α, for the outer concrete compression zone is introduced into a simplified analytical model. Factors affecting α are determined, and the degree of influence of these factors is investigated via orthogonal numerical simulations. The numerical results show that α can be specified as approximately 0.2 for most metro shield tunnels in China. Subsequently, a case study is performed to verify the rationality of the simplified theoretical analysis for the segment joint via numerical simulations and experiments. Using the proposed simplified analytical algorithms, a parametric investigation is conducted to discuss the factors affecting the ultimate compressive bending capacity of the joint. The method for optimizing the joint flexural stiffness is clarified. The results of this study can provide a theoretical basis for optimizing the design and prediciting the damage of bolted segment joints in shield tunnels.

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Keywords

shield tunnel / segment joint / joint structural model / failure mechanism

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Xiaojing GAO, Pengfei LI, Mingju ZHANG, Haifeng WANG, Zenghui LIU, Ziqi JIA. Analytical algorithms of compressive bending capacity of bolted circumferential joint in metro shield tunnels. Front. Struct. Civ. Eng., 2023, 17(6): 901‒914 https://doi.org/10.1007/s11709-023-0915-8

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Notations

h: core concrete thickness
h1: distance from the bottom edge of the sealing gasket to the neutral axis of the segment
h2: concrete thickness of outer edge
h3: caulking width of sealing gasket
h4: inner edge concrete thickness
b: segment thickness
d: distance from the lower edge of the sealing gasket to the bolt
d1: distance from bolt to inner edge of segment
2t: bolt length
Δ: segment joint gap
y: compression zone height of segment
θ: joint corner
Tb: bolt tension
σc: compressive stress on the upper edge of the segment core concrete
σc: compressive stress at the lower edge of segment core concrete
σcmax: compressive strength of segment concrete
α: height adjustment coefficient of outer concrete compression zone

Acknowledgements

This study was supported by the National Natural Science Foundation of China (Grant Nos. 51978019 and 52278382) and the Natural Science Foundation of Beijing Municipality (No. 8222004).

Conflict of Interest

The authors declare that they have no conflict of interest.

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2023 Higher Education Press
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