Recently, the final rock and soil layer of the Zhushan Tunnel on the Nanning-Yulin High-Speed Railway was successfully breached, marking the smooth breakthrough of the Zhushan Tunnel.

Located on the south side of Wangtang Village, Hengzhou City, Guangxi Zhuang Autonomous Region, the Zhushan Tunnel is a single-tube double-track tunnel with overall surrounding rock of Grade V. To ensure the tunnel could break through on schedule, the project department maximized the continuity of construction procedures and optimized the process flow during construction to comprehensively improve construction efficiency. Faced with problems such as the shallow overburden at the tunnel portal and major safety hazards, they carried out the tunnel secondary lining construction only after four procedures: first self-inspection, grouting, second self-inspection, and third-party testing. At the same time, they organized construction by adding advance support and strengthening the secondary lining support strength.

According to reports, a 220 kV high-voltage tower stands on the top of the mountain where the Zhushan Tunnel is located, making relocation difficult and blasting impossible. In addition, the tunnel is located near a village, so blasting could easily disturb residents. After multiple rounds of scheme discussions, the construction unit ultimately adopted a purely mechanical excavation method. The breakthrough of the Zhushan Tunnel has connected the girder erection passage across the entire project line, marking that the construction of the entire Nanning-Yulin High-Speed Railway will be further accelerated.

The Nanning-Yulin High-Speed Railway is an important component of Guangxi's trunk railway network and a key project coordinated and advanced by the autonomous region. After the project is completed and opened to traffic, the train travel time from Nanning to Yulin will be shortened from 2 hours and 05 minutes to 33 minutes, further optimizing the region's comprehensive transportation system and effectively solving problems such as the currently incomplete road network system in Guangxi and the insufficient capacity of external corridors. It is of great significance for accelerating Guangxi's comprehensive integration into the Guangdong-Hong Kong-Macao Greater Bay Area.