新建盾构隧道下穿既有地铁隧道沉降变形影响研究

A Study on the Effects of Settlement and Deformation Caused by a New Shield Tunnel Passing under an Existing Subway Tunnel

摘要: 本文以怡海站~鲤鱼门站区间隧道工程为背景，采用Midas GTS有限元数值模拟软件开展施工仿真分析。通过研究盾构下穿过程中既有隧道管片竖向位移、水平位移及地面的沉降变形，探究盾构下穿施工对既有管线及场地周边建筑物设施的扰动影响。数值模拟结果表明，该盾构下穿施工方案对周边既有结构产生的变形扰动较小，施工安全可控。

Abstract: This paper uses the tunnel project between Yihai Station and Liyumen Station as a case study and employs Midas GTS finite element numerical simulation software to conduct construction simulation analysis. By studying the vertical and horizontal displacements of the existing tunnel segments and ground settlement during the shield tunneling process, this study investigates the impact of the shield tunneling construction on existing utility lines and surrounding buildings and facilities. The numerical simulation results indicate that this shield tunneling construction plan causes minimal deformation disturbances to existing surrounding structures, and construction safety is manageable.