Zhoushan Lujiashi Submarine Tunnel
Release time:
2025-12-24
Abstract
Construction unit: China Railway Tunnel Bureau Group Co., Ltd.
Device Number: ("Xianxinghao" Tunnel Boring Machine) China Railway Equipment
Cutting disc diameter: 11.70 meters
Tunneling length: 770 meters
Project Features:
Geological construction risks are prominent: The minimum burial depth at the tunnel boring machine (TBM) launch section is only 6.2 meters, making it an ultra-shallow buried tunnel. The geological strata consist primarily of highly plastic, low-bearing capacity silty clay, which easily leads to issues such as TBM nose-down and uplift of tunnel segments. Additionally, the tunnel needs to pass beneath drainage boards and the Lujiashi seawall, crossing two pile-driving zones. In the seawall section, PVC drainage boards penetrate the tunnel by 3 to 4.1 meters, posing a high risk of entanglement with the cutterhead blades. This project is a benchmark transportation project within the province: it is Zhejiang Province’s first highway tunnel constructed using a shield tunneling method under the sea.
Year of commencement: January 2019
Year of completion: January 2021
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