Application of Arch Changing Construction Technology in Expressway Karst Tunnel
Expressway tunnels in karst areas often encounter bad geology such as karst.When karst occurs,it is easy to cause problems such as arch falling and collapse,which leads to the deformation and limit of the steel arch frame.Therefore,it is necessary to re-reinforce the surrounding rock and replace the steel arch frame with the limit.However,due to the need to remove the steel arch frame before changing the arch,this process will cause the weakening of overall support capacity,too large local stress,and very high safety risk.Taking Hanbang No.2 tunnel of Yuewei Port as an example,this paper discusses the technical points and safety control points of tunnel arch exchange construction in detail,so as to strengthen the risk control in the process of tunnel arch exchange and ensure the safety of tunnel construction.
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