Detailed damage mechanism of deformed shield tunnel linings reinforced by steel plates. (January 2023)

• Record Type: Journal Article
• Authors: Li, Zhen; Liu, Xuezeng; Lai, Haoran; Yang, Zhilu; Wang, Bozhi
• Is Part Of: Engineering failure analysis. Volume 143:Part A(2023)
• Publication Date: 2023-01
• Subjects: Shield tunnels -- FE modelling -- Bond damage -- Steel plate reinforcement; System failures (Engineering) -- Periodicals; Fracture mechanics -- Periodicals; Reliability (Engineering) -- Periodicals; Pannes -- Périodiques; Rupture, Mécanique de la -- Périodiques; Fiabilité -- Périodiques; Fracture mechanics; Reliability (Engineering); System failures (Engineering); Periodicals; Electronic journals; 620.112
• DOI: 10.1016/j.engfailanal.2022.106850
• Languages: English
• ISSNs: 1350-6307

Abstract

Highlights: Propose an FE approach to reasonably simulate the bond behavior between steel plates and linings. Reveal the detailed damage mechanism of the segmental lining reinforced by steel plates. Explore the influence of the existing deformation degree on the lining performance after reinforcement. The structural deformation before reinforcement should be limited to guarantee the reinforcement effectiveness. Abstract: To ascertain the variance in the detailed damage characteristics of tunnels reinforced at different deformation degrees with steel plates, a refined finite element (FE) model of a stagger-jointed shield tunnel was established, and an FE approach to simulate the bond behaviour between steel plates and linings was proposed. After the rationality of the FE analysis was verified with a refined physical model test on the steel-plate-reinforced tunnel, a series of FE simulations were performed to investigate the influence of the existing deformation on the detailed damage mechanism of the post-reinforcing lining. The results show that the bond damage occurring near the crown is mainly caused by the combination of tension and shear and has high brittleness, whereas the bond damage occurring near the waist is mainly caused by shear and has high ductility. A decrease in the existing structural deformation before reinforcement improves the effectiveness of steel plate reinforcement, as manifested by less bond damage near the crown, a better co-bearing effect between steel plates and segments, and a greater improvement in the flexural stiffness of the joints near the waists. To guarantee the effectiveness of the steel plate reinforcement on the deformed tunnel, it is reasonable to set the upper limit of the structural deformation before reinforcement at 15.0‰ of the outer diameter of the segmental ring.