Total excavation of main line of small Three Gorges tunnel of Zhengzhou Wanzhou high speed railway is 17000 meters

Our news (reporter Xiang Yongwen / Figure) at 9:18 a.m. on December 23, the main tunnel between Hengdong 1 and Hengdong 2 of the small Three Gorges tunnel of Zhengzhou Wanzhou high speed railway was safely and smoothly connected. This connection marks the release of major risk karst in the longest high-risk tunnel along the line, laying a solid foundation for the whole tunnel connection. The small Three Gorges tunnel of Zhengzhou Wanzhou high speed railway is the longest single hole double line high speed railway tunnel in Asia under construction at present, and the only class I high risk tunnel in Chongqing section of Zhengzhou Wanzhou high speed railway, which is the control project of the whole line.

the main tunnel of the small Three Gorges tunnel running through the section from Hengdong No.1 to Hengdong No.2 has complex geological conditions, crossing qiyaoshan anticline, belonging to the section with strong karst development, mainly in the form of karst spring, underground river and karst pipeline. In order to relieve the pressure of the construction period, the construction company optimized the construction organization design, reduced the length of the Karst Section of the single head driving in the working area of No. 1 horizontal tunnel, and increased the working face of the main tunnel in advance through the horizontal guide. At the same time, the advanced geological prediction is included in the process management, which can effectively guarantee the construction safety of Karst Section on the premise of detecting the geological conditions ahead. Zhu Jianguo, deputy civil engineer of the small Three Gorges tunnel of

zhengwan high speed railway, introduced that the small Three Gorges tunnel belongs to the high-risk tunnel of Chongqing section of zhengwan railway, and its risk is mainly karst accumulation and water inrush. This section is also mainly concentrated in the construction section of No.1 and No.2 horizontal tunnels. At present, the section is safe and smoothly connected, which basically relieves the accumulation and water inrush risk of the small Three Gorges tunnel The safe and smooth running of the tunnel has laid a solid foundation.

at present, there are four working faces of Zhengzhou Wanzhou high speed railway small Three Gorges tunnel constructed at the same time. The construction company will strictly organize and manage the construction, strengthen coordination and cooperation, and better and faster promote the follow-up project. Up to now, the small Three Gorges tunnel has been safely excavated 17168 meters and completed 90% of the total construction task. It is expected that the tunnel will be completed in May 2020. At that time, it will provide strong support for the opening of Zhengzhou Wanzhou high speed railway. According to

, the total length of Zhengzhou Wanzhou high-speed railway is 818km. When it is completed and opened to traffic, it will become the main high-speed passenger transport channel connecting the Central Plains and the southwest. At that time, it will only take more than two hours from Wushan to Zhengzhou and about four hours to Beijing.