The latest development of Shantou Railway: from the entrance of the mine section of Shantou Bay Cross Harbour Tunnel to the completion of No. 1 inclined shaft, a total of 7490 meters have been dug.

Thanks to CTOnews.com netizens for your clue delivery! CTOnews.com reported on November 20 that after more than 800 days, the entrance of the Shantou Bay Cross Harbour Tunnel mine section of the Shantou Bay Cross Harbour Tunnel built by the 14th Bureau of China Railway was successfully opened to the No. 1 inclined shaft yesterday, and was successfully connected with the No. 1 inclined shaft construction section. At present, the tunnel has been excavated a total of 7490 meters, with an overall length of more than 76 per cent.

CTOnews.com learned that the Shantou Bay Cross Harbour Tunnel, with a total length of 9781 meters, is the world's first single-hole and double-track high-speed railway undersea tunnel with a design speed of 350km / hour. it has poor geological conditions and is a heavy and difficult project and a high-risk project along the whole line.

According to the construction plan, the Shantou Railway starts from Shantou Station in Shantou City in the east, passes through Huilai County of Jieyang City and Lufeng City and Haifeng County of Shanwei City, introduces Shanwei Station of Xiamen-Shenzhen Railway and runs directly with Guangzhou-Shantou Railway. There are 7 stations in Shantou, Shantou South, Chaonan, Huilai, Lufengdong, Lufengnan and Shanwei. The length of the new main line is 162.368 km, of which 35 bridges are 113.691 km and 13 tunnels are 32.404 km. The bridge-tunnel ratio is 89.77%, and the speed target is 350 km / hour. it is scheduled to be completed and opened to traffic in September 2023.

According to reports, this section of the tunnel is divided into sea section and land section, and the combined construction scheme of "open-cut method + shield method + mining method" is adopted. three mine legal areas of entrance, No. 1 inclined shaft and No. 2 inclined shaft are set up on the south bank, and a shield work area is set up on the north bank. The north and south banks are facing each other, and many working faces are excavated together.

Officials said that the Shantou Bay Cross Harbour Tunnel is a key control project of the whole line of the Shantou Railway. At present, the mine section of the tunnel has been dug a total of 5378 meters, and the whole tunnel has been excavated a total of 7490 meters, accounting for 76.58% of the overall length. The remaining two sections are not connected.