南京地区土层性质复杂,地下水位高。在该地区实施浅埋暗挖隧道风险较高,特别是富水岩面坳沟地段,如何有效控制地下水是工程成败的关键。结合南京轨交4号线云南路站—鼓楼站区间工程,介绍了采取超前大管棚、小导管支护、掌子面超前注浆加固、临时仰拱等技术措施,实现了隧道开挖面在无降水条件下的施工过程。 The soil layer in Nanjing is complex in nature with high groundwater table. The key to the success or failure of the project is how to control groundwater effectively in the area where there is a high risk of carrying out shallow-buried excavated tunnels, especially in the gully area of ​​the water-rich rock face. In combination with the section of Yunnan Road Station - Gulou Station on Nanjing No.4 Rail Transit Line, technical measures such as advance large pipe shed, small duct support, forward grouting reinforcement of face and temporary back arch are introduced, and the tunnel excavation face In the absence of precipitation conditions of the construction process.