ABSTRACT
Tunnels play a vital role in the modern city transportation system. This study investigated the reliability of the shield tunnels along with their service life, considering the influence of uncertainty corrosion on the segment reinforcement and the joint bolts. Firstly, the Gamma random process model was adopted to illustrate the material corrosion depth variation with time, according to the corrosion measurements from tunnel practice. Then, the framework for the reliability calculation process of the tunnel structure was proposed based on the secondary development method for Abaqus in Python. Finally, the tunnel structure’s reliability and the corresponding failure probability curves under different corrosion conditions over time were evaluated. It was found that the failure probability of the joint section under the ultimate limit state may increase to 100% under 30% corrosion of the bolts. The results indicated that the corrosion of bolts and the steel reinforcement, which deteriorate the bearing capacity and stiffness of the segment, can lead to an increase in the failure probability of the tunnel along with its service life.
