Abstract：Research purposes: Fenghuoshan tunnel is located in a special area featured with high altitude, cold and permafrost. Several special difficulties, such as control of freeze-thaw cycle, action of frost heave force, waterproof and drainage technology have to be solved in design of the tunnel, which are key points in the tunnel construction.
Research conclusions: The paper discusses considerations and methods for the design of tunnels in high altitude, cold and permafrost area by analyzing the technical solutions for Fenghuoshan tunnel, and presents references for the similar project. The general design idea for the permafrost tunnel is ”protecting permafrost" with mufti-technique measures, including heat insulation, complex frost heave resistance, integrated waterproof, etc.，to effectively restrict freeze-thaw cycle development and to eradicate the root causes of frost heave.
黄双林. 青藏铁路风火山隧道设计难点探讨[J]. 铁道工程学报, 2008, 25(8): 45-49.
HUANG Shuang-lin. Discussion on the Difficulties in Design of Fenghuoshan Tunnel in Qinghai-Tibet Railway. 铁道工程学报, 2008, 25(8): 45-49.
2008, Vol. 25 
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