比较全面地介绍了遂渝铁路引入线第2标段龙凤隧道下穿渝合高速公路尖山子隧道的施工方法。从施工总体原则与要求着手，依次介绍了主要施工步骤与方法：管棚施工、开挖及支护、施工监测、仰拱与衬砌施工等，同时简要介绍了应采取的相关防护措施、应急保证措施。

The paper presents the construction method adopted for the construction of Longfeng tunnel on bid 2 section of approach line of SuiYu railway, which penetrates across underneath the existing Jianshanzi tunnel on Yuhe highway. From the general principles and requirements for the tunnel construction, the paper presents in detail such tunnel construction sequences as installation of piperoof protection, excavation and reinforcement, measurement and monitoring, installation of invert and lining. Furthermore, the paper briefly presents the protection measures and contingency countermeasures taken for the tunnel construction.