超小净距交叉隧道先上后下施工位移响应及结构安全分析

以南龙铁路矮陂隧道下穿先行施工的新埔上隧道工程为背景，运用FLAC3D数值分析软件，模拟分析了超小净距交叉隧道先上后下施工时的位移响应及结构安全问题，并采用现场监测数据对数值计算结果进行了验证。结果表明:计算及实测数据均满足《铁路隧道设计规范》（TB10003-2005）的相关要求。目前该工程已经顺利完工，实践证明，在合理的超前支护及衬砌结构下，先上后下施工的方法是安全可靠的。

Analysis of Displacement Responses and Structural Safety of Super-closely-spaced Cross Tunnels during Upper-lower Construction

The simulation analysis is performed for Xinpushang tunnel first constructed above Aibei tunnel of the Nanlong railway by FLAC3D numerical analysis software to determine displacement responses and structural safety of the super-closely-spaced cross tunnels and the numerical calculation result is verified by the site monitoring data. The result shows that the calculation and the measured data meet the relevant requirement of Railway Tunnel Design Specification. At present the project has been smoothly completed, practice has proved. At present, the project has been successfully completed, and practice has proved that if reasonable advance support and lining structure are provided, the upper-lower construction method is safe and reliable.