Abstract To address the deformation control challenges in the construction of large-section mined metro tunnels in upper-soft and lower-hard strata, this study employs numerical simulations and field monitoring to investigate the structural mechanical behavior and deformation patterns of extra-long pipe roof as advanced support. The deformation control efficacy is systematically analyzed. The results demonstrate that extra-long pipe roof effectively mitigates deformation, eliminates risks associated with construction method transition, and exhibits high structural stability. The implementation of extra-long pipe roof reduces crown settlement by 16.9 mm, keeping deformations with?in allowable limits. Additionally, structural stress states are improved, with the arch stress decreasing by 11%-25%,
and stress concentration in the vault structure is effectively alleviated.
Abstract：
To address the deformation control challenges in the construction of large-section mined metro tunnels in upper-soft and lower-hard strata, this study employs numerical simulations and field monitoring to investigate the structural mechanical behavior and deformation patterns of extra-long pipe roof as advanced support. The deformation control efficacy is systematically analyzed. The results demonstrate that extra-long pipe roof effectively mitigates deformation, eliminates risks associated with construction method transition, and exhibits high structural stability. The implementation of extra-long pipe roof reduces crown settlement by 16.9 mm, keeping deformations with?in allowable limits. Additionally, structural stress states are improved, with the arch stress decreasing by 11%-25%,
and stress concentration in the vault structure is effectively alleviated.
FENG Jimeng1,
2 SONG Jiadai1,
2 WANG Shengtao3 LI Yifei1 etc
.Study on the Deformation Control Effectiveness of Extra-long Pipe Roofs in
Large-section Tunnels in Reclamation Strata[J] MODERN TUNNELLING TECHNOLOGY, 2025,V62(4): 155-162
2025, Vol. 62 