Combined with the practices in geologic exploration and construction of Jiaogou II tunnel work in Xi an Ankang Railway in this paper the geologic situations are introduced in detail.

• 结合西康铁路蛟沟二号隧道的勘测地质和施工地质的实践,对施工地质情况作了详尽的分析,得出此隧道变更较多的原因,指出此隧道工程交付使用后,未发现病害现