en.Wedoany.com Reported - On May 27, the Gongling No. 1 Tunnel—the first over-1,000-meter tunnel on the Cenxi East to Guangdong-Guangxi border section of the Nanning–Zhuhai High-Speed Railway (hereinafter referred to as the "Nanzhu HSR")—was successfully bored through, laying a solid foundation for subsequent track laying and the full-line opening of the Nanzhu HSR in 2027.
Located in Guiyi Town, Cenxi City, the Gongling No. 1 Tunnel was invested and constructed by Guangxi Communications Investment Group, built on behalf of China Railway Nanning Bureau Group, and undertaken by China Railway No. 5 Engineering Group. The tunnel has a total length of 1,061.05 meters, with Grade IV and V weak surrounding rock accounting for 100% of the section. The maximum overburden depth is about 89.14 meters, while the shallowest is only 3 meters. It passes beneath three shallow-buried sections in total, featuring fractured surrounding rock and extremely thin soil cover, posing high risks of roof collapse and making construction highly challenging.
Facing complex geological conditions and construction challenges, Guangxi Nanyu Railway Co., Ltd., in collaboration with China Railway No. 5 Engineering Group, scientifically carried out preliminary planning, applied technical measures and methods such as advanced geological forecasting, monitoring and measurement, and advance support, built a digital management and control technology system, and dynamically adjusted support parameters. They introduced equipment like self-propelled invert trestles and automatic waterproof sheet laying trolleys, vigorously optimized construction schemes, strengthened work team management, and tightly controlled work cycles, effectively improving construction efficiency and safety management levels to ensure the tunnel was safely bored through on schedule.
During construction, China Railway No. 5 Engineering Group dynamically optimized blasting techniques to reduce vibration and noise; construction wastewater was discharged according to regulations or recycled after purification treatment, and water spraying for dust suppression was routinely carried out on access roads to strictly control dust pollution, minimizing the impact on the daily lives of surrounding residents.
As of now, 4 of the 8 tunnels on the Cenxi East to Guangdong-Guangxi border section of the Nanzhu HSR have been safely bored through, and the cumulative completion of main tunnel excavation and support for the entire line has reached 69%.
According to reports, the Cenxi East to Guangdong-Guangxi border section of the Nanzhu HSR is an important component of the Yulin–Cenxi section of the Nanzhu HSR and the connecting line between Guangdong and Guangxi. It is a major project for Guangxi's full integration into the Guangdong-Hong Kong-Macao Greater Bay Area. Once the entire line is completed and opened to traffic, it will further improve the regional comprehensive transportation system, help Guangxi build itself into an important strategic hinterland for the Greater Bay Area, promote the "Two Bays Linkage" between the Guangxi Beibu Gulf Economic Zone and the Guangdong-Hong Kong-Macao Greater Bay Area, and serve the national overall situation of opening-up and regional cooperation.
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