Investigation of Corrosion Rate and Rust Expansion Form of Segment Reinforcement for Shield Tunnel by Combined Action of Soil Loading, Chloride Ion and Stray Current

Segment reinforcement corrosion can cause bearing-capacity degradation of shield tunnel, which is unsafe for the metro operation. Therefore, a three-dimensional computational model was proposed in this paper to study rate and rust expansion form segment by combined action soil loading, chloride ion stray current. The results show that arch waist steel middle larger than ends. appears be an eccentric circle. radius size circular center are related non-uniform coefficient maximum current density.