en.Wedoany.com Reported - Recently, the Tuanbazi Tunnel, a key control project of Lot 4 of the Chongqing section of the Yichang-Fuling High-Speed Railway constructed by China Railway Third Bureau, has achieved a cumulative excavation breakthrough of over 1,000 meters, marking a significant milestone and laying a solid foundation for the tunnel's timely completion.
Located in Xingyi Town, Fengdu County, Chongqing, the Tuanbazi Tunnel has a total length of 7,182 meters. It is designed as a single-hole double-track tunnel with a maximum burial depth of 414 meters and a minimum burial depth of only 20 meters. Construction is carried out using a single downhill slope from the entrance to the exit, with bidirectional excavation from both ends. The tunnel features complex geological conditions, with the section from DK408+170 to DK410+050 requiring three-level gas protection, and both the entrance and exit work zones classified as micro-gas zones. The reverse slope construction length reaches 3,444 meters, with a maximum water inflow of 10,107 cubic meters per day, imposing significant power load and drainage pressure, along with high safety risks.
To meet the requirements of gas tunnel construction, the project department has installed an automatic gas monitoring system, deployed full-time inspection personnel for round-the-clock patrols, implemented special approval for hot work operations, enforced the "one blast, three checks" system and 24-hour ventilation protocols, and regularly conducted safety briefings and emergency drills. To address the pressure of reverse slope drainage, the technical research team optimized the layout of the pumping and drainage system, equipped it with high-power, high-lift drainage equipment, and implemented leadership-led shift inspections to ensure smooth drainage. During the excavation of the underground section, the team adopted the "drill-and-blast method," combined with advanced geological prediction technology to dynamically adjust blasting parameters and support forms, strictly controlled process transitions, and ensured safe and efficient tunnel advancement.
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