Ziwei tunnel fragment

First of all, the Pancun Tunnel running through it is located in Xiaoyi Town, Hengzhou District, Nanning, with a total length of 1, 770.47 meters. The surrounding rock of the tunnel is mainly sandstone mixed with mudstone, which softens when it meets water. In the process of tunnel excavation, disasters such as large deformation, falling blocks and landslides are prone to occur. In the process of construction, there have been many unfavorable construction situations such as mud outburst, mud gushing and vault sinking. In areas with poor surrounding rocks and mud gushing, ordinary blasting excavation can only be carried out with traditional rock drills and excavators, and the excavation progress is only 30 to 50 centimeters per day.

Secondly, Nanyu Railway is invested by guangxi traffic Investment Group and undertaken by Nanning Bureau of the State Railway Administration. It is the first high-speed railway with a design speed of 350 kilometers per hour in Guangxi. As far as we know, at present, more than 90% of the subgrade earthwork, bridge engineering and tunnel engineering of Nanyu Railway Project are involved. As an important part of the South-Shenzhen Railway, the travel time from Nanning to Yulin will be shortened from 1 hour 45 minutes to about 50 minutes.

Besides, Nanyu Railway is an important part of Shen Nan Railway. After it is put into operation, the travel time from Nanning to Yulin will be shortened from the fastest 1 hour of 45 minutes to about 50 minutes. To optimize the regional comprehensive transportation structure, build a modern comprehensive transportation system, and help Guangxi speed up? Oriental integration? It is of great significance to promote the linkage between Guangxi Beibu Gulf Economic Zone and Guangdong-Hong Kong-Macao Greater Bay Area and realize the coordinated development of the Pearl River-Xijiang Economic Belt.

The successful completion of the shield tunnel of Nanning-Chongzuo intercity railway in Guangxi indicates that the important project of the new land-sea passage in the west has made great progress in the control project of the new Nanchong railway. It is understood that Nanchong Intercity Railway is the first fully invested high-speed railway in Guangxi, with a total length of 1 19.29 kilometers. Up to now, the completion rate of subgrade engineering, bridge engineering and tunnel engineering has exceeded 98%, and more than half of the station building engineering has been completed. The whole line has entered the stage of two-way track laying and is expected to be completed and opened to traffic in 2022.