Experimental Study on Segment Longitudinal Joints of Shield Tunnel Reinforced with Filament Wound Profile

Abstract

[Objective] With the increasing service life of shield tunnels, demands for reinforcement and maintenance continue to grow. As a new reinforcement material, FWP (filament wound profile) is being increasingly applied, making it significant to study their material properties and reinforcement effectiveness under different joint stress conditions. [Method] Focusing on the segment longitudinal joints of shield tunnel reinforced with FWP, material property tests and joint stress analyses are conducted. The stress performance, failure modes, and failure mechanisms of the reinforced segment longitudinal joints under various stress conditions are investigated through experiments, and the reinforcement effectiveness is evaluated. [Result & Conclusion] The experimental results indicate that the FWP exhibits a compressive ultimate bearing capacity of 689.67 kN, a flexural ultimate bearing capacity of 8.25 kN·m, and an elastic-phase flexural stiffness of 1.93×109 N·mm2. The FWP reinforcement can effectively enhance the bearing capacity and stiffness of the segment longitudinal joints. After reinforcement, the ultimate flexural bearing capacity of the joints reaches 289.29 kN·m under positive bending moment, and 134.95 kN·m under negative bending moment. The interface strength of concrete segment reinforced with FWP is a key indicator of reinforced structure performance. The interface damage and failures could reduce the overall stiffness of the structure.

Keywords

• metro
• shield tunnel
• segment longitudinal joint experiment
• fwp (filament wound profile) reinforcement