ZHANG Haiwang,WANG Zhenming,WAN Fa,et al.Effectiveness of Advanced Support for Shallow-Buried Tunnel Excavation Under-Crossing Provincial Highway in Water-Rich Fractured Zone[J].PEARL RIVER,2025,46(11):35-43.
To address the safety control challenges of shallow-buried tunnels under-crossing provincial highways in water-rich fractured zones
this study took the Genzi Tunnel project (C1 section) of the Guangdong Water Resources Allocation Project in the Beibu Gulf Metropolitan Area as a case study. Numerical simulations and field measurements were employed to investigate the advanced support using small conduits and pipe sheds
and the effectiveness of three advanced support schemes was analyzed: small conduits alone
pipe sheds alone
and combined small conduits with pipe sheds. The findings show that ① The fluid-solid coupling numerical model effectively simulates and predicts the support process during the construction of shallow-buried tunnels under-crossing provincial highways in water-rich fractured zones. ② Dual support and pipe shed support schemes can effectively reduce and control surface subsidence compared to the small conduit scheme. ③ The arching effect generated by pipe sheds induces substantial stress concentrations during initial support at the vault springing of outermost pipe shed elements. Therefore
it is necessary to consider the adverse effect of the possible stress concentration on the initial support force when arranging the support scope of the pipe shed. The dual support scheme integrating pipe sheds and small conduits proves effective in ensuring safety during the construction of tunnels under-crossing provincial highways.
SUN Z Y , ZHANG D L , LI A , et al . Model test and numerical analysis for the face failure mechanism of large cross-section tunnels under different ground conditions [J]. Tunnelling and Underground Space Technology , 2022 , 130 . DOI: 10.1016/j.tust.2022.104735 http://dx.doi.org/10.1016/j.tust.2022.104735 .
ZHAO C Y , LEI M F , SHI C H , et al . Function mechanism and analytical method of a double layer pre-support system for tunnel underneath passing a large-scale underground pipe gallery in water-rich sandy strata: A case study [J]. Tunnelling and Underground Space Technology , 2021 , 115 . DOI: 10.1016/j.tust.2021.104041 http://dx.doi.org/10.1016/j.tust.2021.104041 .
SUN Z Y , ZHANG D L , LIU D P , et al . Insights into the ground response characteristics of shallow tunnels with large cross-section using different pre-supports [J]. International Journal of Rock Mechanics and Mining Sciences , 2024 , 175 . DOI: 10.1016/j.ijrmms.2024.105663 http://dx.doi.org/10.1016/j.ijrmms.2024.105663 .