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

Zheng Li, Hao Jin and Shuo Yu
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Zheng Li: The Key Laboratory of Road and Traffic Engineering, Ministry of Education, Shanghai 201804, China
Hao Jin: School of Transportation, Southeast University, Nanjing 211189, China
Shuo Yu: The Key Laboratory of Road and Traffic Engineering, Ministry of Education, Shanghai 201804, China

Sustainability, 2021, vol. 13, issue 6, 1-19

Abstract: 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 the corrosion rate and rust expansion form of segment reinforcement by the combined action of soil loading, chloride ion and stray current. The results show that the arch waist segment steel corrosion rate in the middle is larger than the ends. The rust expansion form of segment reinforcement appears be an eccentric circle. The radius size and circular center are related to the non-uniform corrosion coefficient and the maximum corrosion current density.

Keywords: subway; segment reinforcement corrosion; rust expansion form; chloride ion; stray current; external loading (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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