Based on the North Extension Project of Xingfu Road,This paper adopted a large-span pipe cur-tain+anti uplift pile advanced active reinforcement system at the underpass of the main line.In this way,the steel pipe curtain was first constructed without unloading the soil at the top of the existing tunnel,and then the pipe curtain and reinforced concrete anti uplift piles were formed into a combined anti uplift structure using a bearing platform.Compared with the passive reinforcement system of similar projects in the past,the construc-tion quality was easier to control and the construction process has also been further simplified.Through finite el-ement analysis,this reinforcement system can meet the requirements of deformation and other indicators for tun-neling,which would provid some reference for similar projects in the future.
TunnelsUnderpassUpliftPipe curtainFinite element analysis
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