【摘要】 随着城市轨道交通的发展，地铁线路越来越密集，不可避免地出现交叉隧道形式，新建隧道上穿既有隧道施工会引起既有隧道结构上浮，影响结构安全。依托某工程，采用理论分析与数值模拟方法，研究新建隧道施工引起下卧既有隧道结构的位移变化规律。研究表明:新建隧道上穿施工导致的既有隧道结构竖向变形以隆起为主，最大隆起出现在与新建隧道相交位置;纵向变形主要发生在拱顶位置;横断面变形表现为横向压缩、竖向拉伸。此研究成果可为新建隧道上穿既有隧道的类似工程提供参考依据。更多还原

【Abstract】 With the development of urban rail transit,the subway lines are becoming more and more dense,and the form of cross tunnel is inevitable. The construction of new tunnel overpassing the existing tunnel will cause the existing tunnel structure to float up and affect the structural safety. Based on a project,the displacement change law of the existing tunnel structure underneath caused by the construction of a new tunnel is studied by using the theoretical analysis and numerical simulation methods. The research shows that: the vertical deformation of the existing tunnel structure caused by the overpassing construction of the new tunnel is mainly uplift,and the maximum uplift occurs at the intersection with the new tunnel; the longitudinal deformation mainly occurs at the vault; the deformation of cross section is shown as horizontal compression and vertical tension. The research results can provide reference for similar projects of the new tunnel overpassing the existing tunnel.更多还原