Abstract
Shield tunnels, especially those with small curvature radii, are currently used in the construction of underground rail transit, and they provide important support for the future development and utilization of underground space. Generally, tunnel curvature radii no more than 350 m are considered small, and the corresponding tunnel mechanical properties are more complex than those of a straight tunnel, introducing unprecedented challenges to shield construction. Therefore, the main load types that affect the mechanical properties of shield tunnel segments with small curvature radii are summarized. Based on the Wugensong–Guangdu shield zone in the Chengdu metro No. 1 southward line, the shield machine in this area adopts passive articulation system, in situ monitoring of the segment strain and the gap between rings is conducted, and the indoor model uniaxial compression testing is performed considering only the jack thrust as the longitudinal load. The results show that the segment strain and the gap between rings are mainly affected by the jack thrust, and the axial strain is twice the circumferential strain. In the construction of shield tunnels with small curvature radii, segment damage is more likely to occur on the outer side of the tunnel axis than on the inner side. For a shield tunnel of a certain curvature, the construction difficulty during driving increases in the order of the straight line section, in (out)-curve section and full-curve section. For the same propulsion stage, the smaller the curvature radius is, the easier the segment can be damaged. These research results are of great significance to the safe construction of shield sections with curvature radii for underground rail transit in the future.
Highlights
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The main load types that affect the mechanical properties of small curvature shield tunnel segments were summarized.
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The strain and gap at different monitoring positions during the whole construction process were monitored on the engineering scale.
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Through the designed “side V-shaped” loading test, the mechanical characteristics of segments with different small curvature radii in different stages were analyzed.
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Data availability statement
The data that support the fndings of this study are available on request from the corresponding author, upon reasonable request.
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Acknowledgements
This research is financially supported by the National Natural Science Foundation of China (Grant no. 52225403), and Sichuan Science and Technology Program (Grant no. 2023NSFSC0004).
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Conceptualization: [GM]; Methodology: [GM] and [LF]; Formal analysis and investigation: [LF] and [QZ]; Writing—original draft preparation: [GM] and [LF]. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Gao, M., Li, F., Qiu, Z. et al. Mechanical Behaviors of Segments in Small Curvature Radius Intervals of Shield Tunnels: From Field Monitoring to Laboratory Testing. Rock Mech Rock Eng 56, 8115–8134 (2023). https://doi.org/10.1007/s00603-023-03488-9
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DOI: https://doi.org/10.1007/s00603-023-03488-9