湿陷性黄土区域输水隧洞下穿高速公路施工方案

On the Construction Plan of a Water Diversion Tunnel Down-traversing a Motorway in a Collapsibility Loess Region

某输水隧洞位于湿陷性黄土地区,该区域成洞条件较差,并且存在渗水、涌水问题,在施工过程中掌子面极易发生塌方。在这种不良地质条件下,该输水隧洞还需下穿一处已建高速公路,在隧洞施工工程中,为保障高速公路路基的稳定,文中对穿越段施工方案进行了详细研究。

A certain water diversion tunnel engineering is located in a collapsibility loess region,in which the condition to form a tunnel is bad, and the water infiltrating and water gushing problems exist and in construction process it is prone to form collapse on the excavated tunnel＇s heading face.Under this adverse geological condition, the tunnel needs to down-traverse a constructed motorway. In order to ensure the stability of this motorway＇s foundation in the tunnel＇ s construction process, the detailed analysis on this construction plan is narrated in the paper.