my country's deepest undersea tunnel has completed shield excavation: the maximum underwater depth is 115 meters and the total length is 13.69 kilometers

According to news from this site on August 13, the official public account of "Shenzhen Release" stated that in my country's deepest undersea tunnel - the Pearl River Mouth Tunnel of the Shenjiang Railway, the super-large diameter shield machine "Dawan District Code" took the lead in completing all 1468 rings. The excavation task has reached the set mileage, marking significant progress in the construction of the entire Shenjiang Railway.

The Shenjiang Railway is an important part of the coastal corridor of the national "Eight Vertical and Eight Horizontal" high-speed rail network. Since the line needs to cross the Pearl River estuary between Guangzhou and Dongguan, the geological and hydrological conditions are very complex. After several comparisons and selections, the design plan was finally selected. The road-rail dual-purpose bridge was converted into a tunnel underpass.

As a full-line control project, the Pearl River Mouth Tunnel of the Shenjiang Railway is 13.69 kilometers long and uses two shield machines to tunnel in opposite directions. The Section 2 shield tunnel constructed by China Railway Tunnel Bureau is 2,930 meters long. The tunnel has a maximum underwater depth of 115 meters and a maximum water pressure of 1.06 MPa. It has set a record for the deepest subsea railway tunnel in my country. According to previous reports on this site, the project started in December 2021. The "Dawan District Code" shield machine was tailor-made for the Pearl River Estuary Tunnel of the Shenzhen-Shenzhen Railway. The excavation diameter reached 13.32 meters, the total length was 133 meters, and the total weight was about 3,900 ton.

The "Dawan District Code" shield machine passed through nearly 21 types of geology and 9 fault fracture zones. During this period, it achieved a record of 24 meters of tunneling in a single day and a maximum tunneling of 432 meters in the month.

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