Life-cycle reliability analysis of shield tunnels in coastal regions: emphasis on flexural performance of deteriorating segmental linings |
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| Authors: | Zheng-Shu He Chuan He Dan M. Frangopol Si-Jin Liu |
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| Affiliation: | 1. Department of Civil and Environmental Engineering, Waseda University, Tokyo, Japan;2. MOE Key Laboratory of Transportation Tunnel Engineering, Southwest Jiaotong University, Chengdu, P.R. China;3. Department of Civil and Environmental Engineering, Engineering Research Center for Advanced Technology for Large Structural Systems (ATLSS Center), Lehigh University, Bethlehem, PA, USA |
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| Abstract: | In contrast to reinforced concrete (RC) structures on land, RC shield tunnels in coastal regions deteriorate rapidly after their construction because of the combined effects of multiple mechanical and environmental stressors. In this paper, by considering the coastal hazards associated with chloride and the impacts of hydrostatic pressure, a novel approach is presented to estimate the life-cycle structural performance of a shield tunnel that has undergone deterioration due to chloride-induced steel corrosion. Deterioration processes in segmental linings are investigated via corrosion-accelerated experiments on individual segments, and the combined effects of corrosive agents and loads are emphasized. Monte Carlo simulation is used to estimate the time-variant failure probability of shield tunnels in a marine environment. In an illustrative example, the effects of structural location, hydrostatic pressure and material properties on the life-cycle reliability of shield tunnels are investigated. |
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| Keywords: | Reinforced concrete shield tunnel hazard assessment chloride hydrostatic pressure deterioration corrosion initiation time-variant failure probability |
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