Shantou Bay Tunnel
Release time:
2025-12-24
Abstract
Construction unit: China Railway Tunnel Bureau Group Co., Ltd.
Device Number: ("China Railway No. 306" Tunnel Boring Machine) China Railway Equipment
Cutting disc diameter: 15.03 meters
Tunneling length: 3047 meters
Project Features:
It is the world’s first large-diameter shield tunnel located in an area with an earthquake intensity of 8 degrees. It is also Guangdong Province’s first highway tunnel constructed using the shield method beneath the sea, and has been dubbed “the most challenging large-diameter shield project” in China. At its deepest point, the tunnel lies 98.5 meters below sea level, situated in a region experiencing high seismic intensity of magnitude 8. To overcome such challenges as nearly 100-meter-high water pressure and severe chloride corrosion, the tunneling machine had to bore through extremely hard granite formations with a compressive strength of up to 200 megapascals. The shield tunnel section successfully passed through a 135-meter-long fault zone thanks to advanced ground consolidation measures applied ahead of the tunnel face. During construction, the team set new records: 14 meters per shift, 24 meters per day, and 432 meters per month—breaking the previous record for domestically produced ultra-large-diameter slurry balance shield machines.
Year of commencement: February 2015
Year of completion: August 2020
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