At 10 a.m. on April 2, with the sound of an explosion, the Banqi Tunnel—the last long tunnel on the Chongping Railway constructed by China Railway First Group—was successfully holed through. With this, all tunnels on the main line of the Chongping Railway have been fully connected, laying a solid foundation for the railway to be completed and opened to traffic on schedule in 2025.
The newly built Chongzuo-Pingxiang Railway has a main line length of 81.12 km, with a bridge-tunnel ratio of 85.63% across the entire line, including 55 new bridges and 22 tunnels. Four new stations will be established: Chongzuo South Station, Ningming East Station, Longzhou Station, and Pingxiang East Station, with a design speed of 250 km/h.
It is understood that the Banqi Tunnel is one of the most challenging tunnels on the Chongping Railway line. Located in Longzhou County, Chongzuo City, the tunnel has a total length of 3,795.739 meters, a designed longitudinal gradient of 20‰ on a single upward slope, a maximum burial depth of approximately 233.55 meters, and a minimum burial depth of 35.5 meters. It is a Class I risk tunnel, with risks including portal instability, collapse, water and mud inrush, and dangerous rockfall, testing the project's organizational management capabilities and safety control level.
In the face of interference from constraints on tunnel construction, the Chongping Railway Project Department of China Railway First Group adopted advanced geological forecasting and an automatic monitoring and measurement early-warning system to "prescribe the right remedy" during construction. Through monitoring and measurement, it effectively predicted the nature, distribution location, scale, and other information of possible adverse geological bodies ahead of the tunnel and the geological disasters they might trigger, thereby achieving automatic early warning, effectively reducing safety risks, and guiding smooth construction. At the same time, different advanced support technologies were adopted for different strata to strictly control tunnel settlement and deformation, greatly reducing construction difficulty.
During construction, the project department established a "Party Member Commando Team" and a "Youth Commando Team," and proactively established joint construction and co-building mechanisms with the government, the owner, and other units, coordinating forces from all parties to promote the steady progress of the Chongping Railway construction, ensuring timely discovery and resolution of problems, and giving full play to the role of the Party branch as a fighting fortress and the vanguard and exemplary role of Party members.
In addition, the project department continuously optimized the construction plan based on the actual conditions of the tunnel and obtained a utility model patent for a reinforcement structure for underground river karst tunnels, ensuring the quality and safety of tunnel construction. At the same time, smooth blasting technology was promoted, and certain achievements were made in ensuring workmanship through tooling and ensuring quality through workmanship.
To solve issues of construction efficiency and quality, the project department set up a scientific research task force, concentrated efforts to overcome difficulties, and achieved mechanized tooling support, dynamic optimization of smooth blasting, and full-process construction control, obtaining both technical and economic benefits. Ultimately, after 18 months of unremitting efforts, the tunnel holing-through work was completed.
The Chongping Railway is a major project coordinated and advanced by the Guangxi Zhuang Autonomous Region. Once completed, the project will achieve full high-speed rail connectivity from Nanning, the capital of the Zhuang region, to the border city of Pingxiang, and via the Nanning-Chongzuo Railway will connect to the Nanning hub and link with the Nanning-Guangzhou, Liuzhou-Nanning (Xiang-Gui), Yunnan-Guangxi railways and the Guiyang-Nanning high-speed railway under construction, forming an important international transport corridor from China to ASEAN. It is of great significance for accelerating the construction of the New Western Land-Sea Corridor, improving border transportation infrastructure, improving regional traffic conditions, and further expanding opening-up.
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