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20 0 3年 7月 9日青藏铁路风火山隧道二次衬砌结束。至此 ,世界上海拔最高的青藏铁路高原冻土隧道主体工程全面竣工。风火山隧道全长 13 3 8m ,位于可可西里无人区 ,轨面海拔高程为 490 5m ,是目前世界上海拔最高的铁路隧道。隧道所处地质环境集含土冻层、饱冰冻土、富冰冻土、
On July 9, 2003, the second lining of the Fenghuoshan tunnel on the Qinghai-Tibet Railway ended. At this point, the main body of the Qinghai-Tibet Railway plateau frozen soil tunnel with the highest altitude in the world has been fully completed. The total length of the Fenghuoshan Tunnel is 13 3 8m, located in an area of no-man’s land in Hoh Xil, with an elevation of 4905m above the surface. It is the highest-grade railway tunnel in the world at present. The geological environment of the tunnel includes soil freezing layer, full frozen soil, rich frozen soil,