Shenjiang Railway Zhujiang Estuary Tunnel
Release time:
2025-12-24
Abstract
Construction unit: China Railway Tunnel Bureau Group Co., Ltd.
Device Number: ("Greater Bay Area" Tunnel Boring Machine) China Railway Equipment
Cutting disc diameter: 13.32 meters
Tunneling length: 2930 meters
Project Features:
The hydrogeological challenges are of world-class magnitude. The tunnel has to pass through 13 different geological strata and 17 fault zones, with a solid rock section spanning an impressive 2.75 kilometers. The granite exhibits a compressive strength as high as 124.6 megapascals, and 22% of the tunnel’s length consists of alternating soft and hard strata. Meanwhile, the maximum water pressure reaches 1.06 megapascals—equivalent to 10.6 kilograms of pressure exerted on the area of a fingernail—and the tunnel’s maximum underwater burial depth is 115 meters, setting a new record for the deepest undersea railway tunnel in China. The tunnel’s geological conditions are exceptionally complex, with highly variable and intricate rock types, posing enormous challenges to both equipment performance and construction techniques. These include three globally challenging issues: long tunnel lengths, ultra-high water pressures, and extremely complex geological formations.
Year of commencement: November 2020
Year of completion: December 2024
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