Influence of secondary lining thickness on mechanical behaviours of double-layer lining in large-diameter shield tunnels

Abstract

In large-diameter shield tunnels, applying the double-layer lining structure can improve the load-bearing properties and maintain the stability of segmental lining. The secondary lining thickness is a key parameter in the design of a double lining structure, which is worth being explored. Based on an actual large-diameter shield tunnel, loading model tests are carried out to investigate the effect of the secondary lining thickness on the mechanical behaviours of the double lining structure. The test results show that within the range of secondary lining thicknesses discussed, the load-bearing limit of the double-layer lining increases with growing secondary lining thickness. As a passive support, the secondary lining acts as an auxiliary load-bearing structure by contacting the segment. And changes in secondary lining thickness have a significant effect on the contact state between the segment and secondary lining, with both the contact pressure level and the contact area between the two varying. For double-layer lining structures in large-diameter shield tunnels, it is proposed that the stiffness of the secondary lining needs to be matched to the stiffness of the segment, as this allows them to have a coordinated deformation and a good joint load-bearing effect.

Keywords

Large-diameter shield tunnels / Double-layer lining structure / Secondary lining thickness / Stiffness matching / Similar model test

CRediT authorship contribution statement

Shimin Wang: Conceptualization, Funding acquisition, Methodology, Project administration, Supervision, Resources. Xuhu He: Formal analysis, Investigation, Validation, Visualization, Writing - original draft, Writing - review & editing. Xiaoyu Peng: Investigation, Validation, Writing - original draft. Ya Wang: Data curation, Formal analysis. Zhengxin Li: Investigation. Zihan Song: Formal analysis.

Declaration of competing interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Acknowledgement

This study is supported by the National Natural Science Foundation of China (Grant Nos. 52178398, 51991394, and 51278424). These supports are greatly appreciated.

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