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

• DOI: 10.1016/j.undsp.2023.11.015
• Publication Date: 2024-03-05T03:19:54Z
• Authors: Shimin Wang; Xuhu He; Xiaoyu Peng; Ya Wang; Zhengxin Li; Zihan Song
• Keywords: Similar model test; Double-layer lining structure; Large-diameter shield tunnels; 0211 other engineering and technologies; TA703-712; Engineering geology. Rock mechanics. Soil mechanics. Underground construction; 02 engineering and technology; Stiffness matching; Secondary lining thickness

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