Wuhan Sanyang Road Yangtze River Tunnel
Release time:
2025-10-22
Abstract
Construction unit: Shanghai Tunnel Engineering Co., Ltd.
Device Number: ("Sanyang No. 1" Tunnel Boring Machine) Herrenknecht
Cutting disc diameter: 15.76m
Tunneling length: 2590 meters
Project Features:
World’s First Public-Rail Integrated Construction Model: This is the world’s first completed shield-tunnel crossing a river that integrates both road and rail transportation. It features a dual-tube, three-layer structure: the top layer serves as a highway smoke-exhaust duct; the middle layer accommodates a six-lane双向 highway; and the bottom layer houses the tracks of Metro Line 7, a shared evacuation passage for both road and rail users, and utility tunnels—all designed to achieve intensive resource utilization. The project faced enormous geological challenges during construction: it had to overcome the dual geological hurdles of the “diamond layer” and the “sticky rice cake” formation. The rock strata contain up to 70% quartz, making them exceptionally hard—resulting in over 2,000 cutter changes throughout the construction process. At the same time, highly cohesive clayey siltstone posed another significant challenge, easily causing cutterhead clogging and mud buildup. To address this issue, the construction team implemented innovative solutions such as injecting hydrogen peroxide. The project has achieved numerous awards and technological breakthroughs: it has successively won prestigious honors including the National High-Quality Engineering Award and the FIIDC Outstanding Engineering Award, and its research achievements have been recognized with the Second Prize of the National Science and Technology Progress Award. During construction, the team developed several technical procedures, including the "Normal-Pressure Cutter-Change Operating Procedures," and the newly developed "First Reverse, Then Forward, Finally Expand" reverse construction method has significantly reduced construction costs.
Year of commencement: December 2016
Year of completion: June 2018
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