盾构隧道下穿国铁站区工程安全性分析

以天津地铁3号线盾构隧道下穿国铁天津站工程为依托，采用荷载-结构模型，验算盾构隧道受力及校核管片配筋及采用地层-结构模型三维数值模拟盾构穿越天津站南北广场联络通道、雨棚基础的地层及结构变形，分析预测盾构隧道施工对既有铁路设施的影响，评估工程安全性，并对施工中采用的工程措施及对策提出建议，保证了既有铁路运营及结构安全。

Safety Analysis on Shield Tunnel underneath Passing Existing Railway Station

Based on the project of shield tunnel of Tianjin Metro line 3 underneath passing Tianjin Railway station, load structure model is used to check bearing capacity and reinforcement of shield tunnel and stratum structure model is adopted to simulate stratum and structure deformation of the undergoing liaison passage and canopy foundation by three-dimensional numerical analyzing software. Construction influence of the shield tunnel on the existing railway facilities is analyzed and predicted. Project safety is assessed and some control suggestions and countermeasures in construction are proposed. Safety for operation and structure of the existing railway is guaranteed. The method and result can give reference to the similar engineering.