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Research on In-situ Expansion Construction Technology for Existing Super-Large Section Tunnels

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  • Lou, Yanbin
  • Cui, Hao

Abstract

Taking the first in-situ expansion project of an existing single-tube three-lane highway tunnel in China (the DaChangshan No.1 Tunnel on the Zhongkai Expressway) as the research object, this paper summarizes and introduces the key technologies involved in the in-situ expansion construction of existing super-large section tunnels, including the lining cutting scheme for large-span tunnels, the temporary support system for in-situ expanded tunnels, and the zonal excavation scheme for tunnel in-situ expansion. The research results can provide a reference for the in-situ expansion construction of existing super-large section tunnels under similar conditions.

Suggested Citation

  • Lou, Yanbin & Cui, Hao, 2026. "Research on In-situ Expansion Construction Technology for Existing Super-Large Section Tunnels," International Journal of Architectural Engineering and Design, Scientific Open Access Publishing, vol. 3(1), pages 22-31.
    • Handle: RePEc:axf:ijaeda:v:3:y:2026:i:1:p:22-31
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