Field experiments and numerical simulations for two types of steel tube lining structures under high internal pressure

作者：He, Haodian; Tang, Xinwei^*; Lin, Shaoqun; Yan, Zhenrui; Li, Daimao

来源：TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY, 2022, 120: 104272.

DOI：10.1016/j.tust.2021.104272

• Water conveyance tunnel
• High internal pressure
• Steel-tube lining structure
• Field experiment
• 3D finite element method

This paper presents the mechanical behavior of two types of steel-tube lining structures in hydraulic shield tunnels. Field experiments were carried out based on the Pearl River Delta Water Resources Allocation Project. Accordingly, 3D finite element models were established to study the ultimate bearing capacity and failure mechanism of the structures. The experimental and numerical results indicated that self-compacted concrete cracking will cause structural stiffness changes and stress redistribution. In the superimposed steel tube lining, the internal pressure is shared by the segments and steel tube, while in the detached steel tube lining, the internal pressure is mainly borne by the steel tube due to the membrane. Both lining structures remained safe under the designed internal pressure, and the segment bolt stress was the final control index to judge the failure of the system. With increasing surrounding rock strength, the ultimate bearing capacity of the structure also increased.