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Research on Stress Characteristics of Segment Structure during the Construction of the Large-Diameter Shield Tunnel and Cross-Passage

1
School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
2
China Railway Design Corporation, Tianjin 300142, China
*
Author to whom correspondence should be addressed.
Symmetry 2020, 12(8), 1246; https://doi.org/10.3390/sym12081246
Received: 10 July 2020 / Revised: 26 July 2020 / Accepted: 27 July 2020 / Published: 28 July 2020
With the intensive development of China’s high-speed railway network and intercity railway network, the construction of the large-diameter shield tunnels and cross-passages is gradually increasing. The construction of large diameter shield tunnels and the excavation of cross-passages puts forward higher requirements for the stability and safety of segment structure. Based on the Wangjing tunnel project, this paper studies the segment displacement and mechanical response of the shield tunnel with a diameter of 10.5 m in the process of shield construction and cross-passage construction. The results show that during the construction of large diameter shield tunnels, the vault and invert produce inward displacement, the invert uplift usually is more severe than the vault settlement, and the arch waist on both sides produces outward displacement. Near the segment K (capping block), the mechanical performance of the segment is close to that of the hinge or chain rod, which can only effectively transmit the axial force but cannot resist the bending moment and shear force. During construction of the cross-passage, the maximum deformation and stress of shield tunnel segment are symmetrically located at the interface of the main tunnel and cross-passage. The upper and lower edges of the segment at the interface tend to change from compression to tension. At the same time, the steel bars on the inside and outside of the segment vault and the arch waist change from compressive stress to tensile stress, which can easily lead to segment damage, so these positions can be reinforced by erecting section steel frames before construction. View Full-Text
Keywords: large-diameter; shield tunnel; cross-passage; shield segment; mechanical response large-diameter; shield tunnel; cross-passage; shield segment; mechanical response
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Tan, Z.; Li, Z.; Tang, W.; Chen, X.; Duan, J. Research on Stress Characteristics of Segment Structure during the Construction of the Large-Diameter Shield Tunnel and Cross-Passage. Symmetry 2020, 12, 1246.

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