In urban subway tunnel construction using the shield tunneling method,it is crucial to strictly control the impact of the construction on existing pipelines.This paper is based on the engineering background of a shield tun-nel in Changchun City,which continuously crosses three urban water supply pipelines.It compares various protec-tion schemes for existing pipelines and employs the Midas GTS NX finite element software for construction simula-tion.The numerical calculation results are compared with actual deformation data,showing that the selected pipeline protection scheme is effective.The research results may provide references for similar projects in the future.
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