Key Technologies and Innovations in the Construction and Operation of the Que'ershan Tunnel
The Que'ershan Tunnel on G317 is the highest-altitude ultra-long highway tunnel in the world.Faced with harsh climatic conditions of severe cold and hypoxia,the construction team pioneered the design concept of"meteorological routing"for highaltitude tunnels,established tunnel ventilation calculation standards for altitudes of 5,000 m,innovatively proposed comprehensive anti-freezing technology for high-altitude tunnel structures,and de-fined oxygen supply standards for high-altitude tunnel construction based on altitude and labor intensity,ensuring that the tunnel was completed and opened to traffic ahead of schedule in 2017.After the tunnel was put into opera-tion,the research team conducted continuous testing and improvements,optimized the asymmetric stepped tunnel insulation defense method,established a tunnel lining structure with high durability for high-altitude seasonally fro-zen soil areas,and defined the altitude grading standards and comprehensive defense principles for highway tunnels.The key technologies for the construction and operation of the Que'ershan Tunnel provide important technical sup-port for the construction and operation of high-altitude highway tunnels in China.
Que'ershan TunnelHigh altitudeSevere cold and hypoxiaComprehensive anti-freezingOxygen pro-duction and supply
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