青海省花石峡到久治高速公路知亥代隧道地处青藏高原，海拔4500多米，隧道进口段主要为季节性冻土冰水堆积层。比较分析了三台阶七步开挖法、CD法、CRD法和双侧壁导坑法的优缺点，总结了三台阶七步开挖法施工工艺，解决了施工中的技术难题，为以后类似工程施工提供参考和借鉴。%The Huashixia-Jiuzhi Expressway Zhihaidai Tunnel in Qinghai Province is located in Qinghai-Tibet Plateau, which is more than 4500 meters above sea level. The tunnel entrance section is mainly seasonal frozen ground ice water stack layers. The advantages and disadvantages of three steps seven footwork method, CD method, CRD method and double-side-drift method are compared and the construction technology of three steps seven footwork method is concluded, which solves the technical problems in construction, providing reference for the construction in the future.
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