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2025/12/23
Hangzhou Qingchun Road Cross-River Tunnel
Among the standout technological innovation projects, a pioneering method—“Liquid Nitrogen Freezing In-Situ Repair of Shield Tunneling Machine Tail Brushes”—has been developed. This breakthrough addresses the persistent challenge of tail brush seal failure in high-pressure water-bearing strata, filling an international gap in this field. Additionally, a dynamic optimization system for shield tunneling construction parameters has been created, enabling real-time collection of 128 key construction parameters. Other innovations include advanced technologies for continuous treatment of high-pressure groundwater. These efforts have collectively resulted in cost savings exceeding 60 million yuan. The hydrogeological conditions are exceptionally complex, with significant variations in mechanical properties, which can easily lead to uneven stress distribution and subsidence of the tunneling machine. Moreover, the Qiantang River’s tidal influence is pronounced, with maximum tidal ranges reaching 5.6 meters and scour depths beneath the riverbed exceeding 7 meters, necessitating that the tunnel be buried as deep as 37 meters. The maximum water pressure reaches 0.47 MPa, and the presence of marsh gas within the strata further complicates the construction process.
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Wuhan Yangtze River Highway Tunnel
The geological conditions are complex: the tunnel needs to pass beneath a riverbed at a depth of 57 meters, where the water pressure is high, and through highly permeable silty fine sand layers as well as unevenly hard and soft rock formations. Addressing technical challenges such as high water pressure, strong permeability, extremely shallow burial, long-distance tunneling, and precise attitude control, the tunnel boring machine (TBM) completed a single-pass excavation of approximately 2.5 kilometers beneath the riverbed, setting a new record at the time for China’s longest tunnel excavated by TBM under complex geological conditions characterized by high water pressure. This tunnel is also the first under-river highway tunnel in China constructed using a TBM with a diameter exceeding 10 meters that has been successfully started and completed. Moreover, it is the first tunnel in China to have been fully excavated through a continuous sandy stratum.
2025/11/07
China Railway Tunnel Bureau Group Co., Ltd.
Beijing Underground Diameter Railway Tunnel
Tianjin Underground Diameter Railway Tunnel
Beijing-Tianjin Intercity Extension Project Section 3
Changsha Nanhu Road Xiangjiang Tunnel
Hangzhou Yanjiang Avenue – Canal and Jiang Tunnel
Baiteng Tunnel on the Menghua Railway
China Railway Fourth Bureau Group Co., Ltd.
Dongjin Tunnel
China Railway Sixth Bureau Group Co., Ltd.
Hengyang Second Ring Road Hejiangtou Xiangjiang Tunnel
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