Zhuhai Tunnel Project
Release time:
2025-12-25
Abstract
Construction unit: China Railway Tunnel Bureau Group
Device Number: China Railway No. 1088 (“Kaikai”) and China Railway No. 1099 (“Fenjin”)
Cutting disc diameter: 15.01 meters
Tunneling length: The total length of the entire project is approximately 5 kilometers, of which 4,480 meters are tunnels. The core tunneling section using shield machines spans a total of 2,930 meters, about 2.7 kilometers of which lie underwater. The TJ2 section, constructed by China Railway Tunnel Bureau, involves a total tunneling distance of 3,800 meters, including the aforementioned 2,930-meter underwater shield tunnel and an 870-meter open-cut section.
Project Features:
The construction environment is complex and the project’s difficulty ranks among the highest in China. According to the Zhuhai Municipal People’s Government: This project is an exceptionally challenging, ultra-large-diameter underwater shield tunnel project in China. The tunnel boring machine (TBM) must traverse a composite geological stratum that is soft above and hard below over a distance of more than 800 meters—a stretch that represents the longest bedrock section ever encountered in a Chinese underwater shield tunnel. At the same time, the TBM will pass very closely beneath numerous existing structures and must also go under two water supply pipelines serving Macao. The clearance between the top of the tunnel and the bottom of the pipelines is only 7.08 meters, making the construction extremely risky.
Year of commencement: December 15, 2020
Year of completion: October 21, 2025
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