新建下穿隧道对既有铁路车站结构的影响分析

Analysis of Influence of New Underpass Tunnel on the Existing Railway Station Structure

重庆轨道交通10号线重庆北站南广场站至北广场站隧道采用曲墙结构垂直下穿重庆北站既有站房结构,采用矿山法进行施工,分析隧道下穿施工对既有车站结构变形及稳定安全的影响具有重大的工程应用意义。本文采用FLAC3D模拟分析了下穿施工对既有车站结构的变形影响,揭示了既有结构的变形特点与规律,为预测施工过程中结构的变形和设计方案的可行性实施提供了理论技术支撑。模拟分析结果与现场实测的既有铁路车站结构变形规律、数值大小及数值基本一致,最大变形量小于控制值,按设计方案进行施工可满足车间安全性要求。

The method that curved wall structure vertically passes under the existing station building of Chongqingbei Station is applied for the tunnel from South Square Station to North Square Station of Chongqingbei Station of Chongqing rail transit line 10,and Mine Method is used for construction. The analysis of underpass construction has big engineering application significance for the structure deformation and stability and safety of the existing station. In this paper,FLAC3D is adopted to analyze the effect on deflection of the existing station building,and to illustrate deformation features and law of the existing structures. Also it provides theoretical and technological supports for feasible implementation which predicts deformation and design scheme during construction process. In conclusion,deformation rules and values from field measure are basically consistent with those of simulation analysis and maximum deformation is less than control value. The construction as per the present design scheme meets the safety requirements.