Analysis on Surface Settlement of Large-section Shallow-buried Tunnel Undercrossing Highway
The characteristics of surface settlement of large-section undercutting tunnel are explored by monitoring the surface settlement in the process of tunnel construction.The results show that the surface settlement is obvious when the large-section shallow-buried tunnel is constructed by Cross Diaphragm(CRD)method.In the excavation process of different pilot tunnels,the characteristics of surface settlement are different.When the right upper pilot tunnel is excavated,the surface settlement deformation and settlement rate are both the maximum values during the construction process.In addition,compared with the surface,the settlement of the road surface is reduced and the width of the settlement groove is increased.Therefore,effective control and monitoring measures should be taken in the construction process to reduce the surface settlement deformation.
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