Referring to the Shiziyang Tunnel – the first underwater shield tunnel for high-speed railway (HSR) in China, model tests and field tests are carried out to study the mechanical properties of the single-layer and double-layer lining structures under hydrostatic water pressure and the interaction between the lining and the stratum. The impact of assembling modes, various ground conditions and water level change on the mechanical behavior of the single-layer lining structure, the influence of the secondary lining construction time, the interface working modes of the double-layer lining structure, and their failure characteristics are investigated and explored in this study. The rationality and reliability of using double-layer lining structure is also discussed.
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