浅埋偏压小净距隧道进洞技术控制要点

Key Points of Entrance Technology Control for Shallow-buried Bias Tunnel with Small Clear Distance

导致隧道偏压的原因一共有三种即施工、地质和地形偏压,在确定隧道结构地形偏压及地质偏压后,需适当使用合适的施工工序及方法,施工方法减少了施工过程中及施工结束后对地形、地质偏压对结构内力的影响,有着十分巨大的现实与工程意义。文章以浅埋偏压小净距隧道以巴岳山隧道为例,通过对软弱围岩小净距严重偏压隧道围岩压力进行分析,以获取了洞口施工顺序,然后,论述了浅埋偏压小净距隧道进洞技术控制要点,以供行业人士参考。

There are three reasons for tunnel bias:construction,geology and terrain bias.After determining the terrain bias and geological bias of the tunnel structure,appropriate construction procedures and methods should be used appropriately.The construction method reduces the influence of the terrain and geological bias on the internal force of the structure during and after the construction,which has a very huge practical and engineering significance.Taking Bayueshan tunnel as an example,this paper analyzes the surrounding rock pressure of small clear distance serious bias tunnel in weak surrounding rock,so as to obtain the construction sequence of tunnel entrance,and then discusses the entrance technical control points of shallow-buried bias tunnel with small clear distance,so as to provide reference for industry.