Study on the Scheme of Large Section Shallow Buried Tunnel Underneath the Existing Highway
A new railroad tunnel under X604 county road in Zhejiang Province is taken as the background of the project,and the influence of different over-head support and tunnel excavation methods on the deformation of the existing highway is analyzed through numerical simulation combined with measured data.The results show that:the surface settlement mainly occurs in the palm face within one times the diameter of the hole,the tube shed in the overrun support is more advantageous in controlling the deformation,but the construction technology is more complicated.The partial excavation can effectively reduce the stress release,the CD method is better than the three-step method and the two-step method in controlling the deformation.By considering the settlement control,economic cost,construction difficulty and other factors,the two-step method and adopting the overrun small conduit grouting support method are more reasonable.
shallow buried tunnelsundercrossing the highwaydeformation controladvance supportCD methodstep methodeconomics
万方数据
维普
