On January 13, the Guli Tunnel, a major and difficult project of the Guiyang Hub Railway Project Department, was successfully holed through. This is the ** node target completed by the project in 2024, and also the last tunnel to be holed through, marking the full opening of the track-laying passage of the Guinan Railway connecting line; the official line and the connecting line are expected to be formally joined soon.

The Guli Tunnel has a total length of 1,014 meters, including 774 m of open-cut section and 240 m of blind-hole excavation. Karst is strongly developed throughout the tunnel, and karst forms such as karst grooves, sinkholes, karst funnels and corrosion depressions are commonly seen on the surface. In particular, the inlet section of about 45 m passes beneath a spoil layer, making collapse highly likely. At the same time, the road at the tunnel inlet is narrow and immediately adjacent to a building construction project under way, which not only adds various safety hazard risks but also frequently obstructs the supply of on-site materials and mechanical equipment, making normal progress of tunnel construction difficult.

It is reported that, to ensure the smooth holing-through of the Guli Tunnel, the contractor organized relevant units to conduct on-site surveys on multiple occasions, continuously optimized the design and construction techniques, and, under the guidance of the Guiyang Construction Command of the Chengdu Railway Bureau, conducted in-depth research and implementation of important schemes such as the spoil-section plan, providing theoretical guidance for the overall advancement of the tunnel. Technical disclosure requirements were strictly implemented to ensure that project management personnel and cooperating teams clearly understood the construction standards and points for attention, laying a solid foundation for standardized tunnel construction. The leadership shift-leading system and real-time liaison mechanism were thoroughly implemented, with full-process monitoring and control of key processes such as excavation footage, advance support and initial support, promptly eliminating risks and hidden dangers and safeguarding tunnel safety and quality. Active communication and coordination were carried out to improve the use efficiency of the construction access road, ensure the supply of materials and machinery for tunnel excavation, greatly enhance on-site work efficiency, and provide strong guarantees for the tunnel's holing-through on schedule.