China opens world's largest underwater shield tunnel in Jinan
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China opened the world's largest underwater shield tunnel beneath the Yellow River in Jinan, Shandong province, on August 25. The 5.8-kilometer Huanggang Road tunnel cuts cross-river travel time from 30-40 minutes to five minutes.
Key Facts
- The tunnel was put into operation on August 25 in Jinan, Shandong province.
- Total length of the tunnel is nearly 5.8 kilometers.
- The tunnel reduces cross-river travel time from 30-40 minutes to five minutes.
- The shield machine 'Shanhe' used for the tunnel has a diameter of 17.5 meters, the largest in China.
- Engineers solved 28 technical challenges during construction, including dam settlement control and prevention of segment buoyancy.
Tunnel Specifications
The tunnel under the Yellow River on Huanggang Road in Jinan was put into operation on August 25. It is the world's largest underwater tunnel built using the shield tunneling method. The total length is nearly 5.8 kilometers, with a double-deck structure in a single tunnel tube. The design speed is 60 kilometers per hour.
Construction and Engineering
The shield-driven section used the 'Shanhe' tunnel boring machine, which has the largest diameter in China at 17.5 meters. During construction, specialists solved 28 complex technical problems. These included ensuring face stability, controlling settlement of the Yellow River dam, and preventing buoyancy of large-diameter tunnel lining segments.
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