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| Analysis of influence of small curvature radius tunnel construction on shield segment structure |
| WANG Zhi1，LIU Xiangyong1，ZHU Xianfa1，HONG Xiaoxing1，SHEN Yiming2，ZHANG Bingli2
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（1. Nantong Urban Rail Transit Co., Ltd., Nantong 226007，Jiangsu，China；
2. Department of Geotechnical Engineering，College of Civil Engineering，Tongji University，Shanghai 200092，China）
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Abstract In order to study the damage mechanism of shield segment structure of shield tunnel with small curvature radius, based on practical engineering cases, a fine lining segment model considering segment joints and inter-ring joints was established to reveal the segment damage mechanism in the construction stage of shield tunnels with small curvature radius. The results showed that the axial force, shear force, positive bending moment and Mises stress of the segment all peaked at the inner and outer arch waists when the shield tunnel with small curvature radius was constructed in the turning section. The arch waist position of segments were more likely to be damaged during the excavation process. When the rectification angle of the jack thrust increased, the overall tunnel deviated to the outside. The outer side of the shield tunnel waist was more obviously affected, since the offset of outer arch waist was significantly larger than that of inner arch waist. The numerical simulation was consistent with the field observation of segment damage, which can provide reference for practical engineering.
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Received: 31 August 2022
Published: 10 December 2022
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