耿家屋基隧道浅埋偏压洞口段施工方案探讨

Discussions on Construction Plan of Gengjia Wuji Tunnel Shallow-buried Bi-as Entrance Segment

文章以贵州省某高速公路耿家屋基隧道进口端浅埋偏压段施工为例,针对不良地质条件,介绍了三台阶留核心土开挖方法结合超前大管棚、径向小导管注浆辅助施工的浅埋偏压洞口段施工方案,为今后公路隧道施工处理类似工程情况提供参考。

With the shallow-buried bias segment construction of Gengjia Wuji Tunnel entrance part of an expressway in Guizhou as the example,and regarding the poor geological conditions,this article intro-duced the shallow-buried bias entrance segment construction program of three-steps excavation meth-od by retaining the core soil,and in combination with advanced large pipe shed and small catheter ra-dial grouting assisted construction,thereby providing the reference for dealing with similar engineering situations in future highway tunnel construction.