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Full‑scale experimental investigation on progressive failure characteristics of shield segmental lining connected through segmental joints containing ductile‑iron joint panels

Zhou Long, Zhu Hehua, Shen Yi, Guan Linxing, Yan Zhiguo, Sun Wei, Li Yaoliang

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 3

art. no. e120

A full-scale experiment was conducted for a deep-buried drainage shield tunnel to be built in Shanghai, focusing on the evolution of mechanical properties and failure process of the segmental lining connected through segmental joints containing ductile-iron joint panels, during the changing process of the inner water pressure and lateral earth pressure. The test results indicate that the damage characteristics of the shield lining are the waterproof failure of the segmental and ring joints, and the concrete cracking failure in the lining. Being diferent from the shield lining without ductile-iron joint panels, the concrete cracks mainly exist around the hand holes of segmental joints. For these kinds of shield tunnel linings containing ductile-iron joint panels, local damage of concrete cracking is prone to occur around the hand holes of segmental joints because of the anchor bars of the joint panels distributed on both sides of the hand holes, and it has a signifcant efect on the lining deformation. In the design of shield linings, efective structural adjustment methods should be adopted to solve this local concrete failure problem.