软土地层超深埋大直径地铁盾构隧道下穿铁路框构桥变形影响规律研究

Research on Deformation Influence Law of Railway Frame Bridge by Ultra-deepBuried Large Diameter Subway Shield Tunnel Undercrossing in Soft Soil Layer

天津某地铁盾构隧道下穿铁路框构桥,所处地层为软土,保证既有铁路运营安全至关重要。为研究盾构掘进对铁路框构桥的影响规律,以数值分析为手段,采用MIDAS GTS计算软件对外径6.6 m双线盾构依次下穿铁路框构桥进行三维数值模拟分析。通过计算,既有结构承载力及裂缝均能满足规范要求。

A subway shield tunnel of Tianjin has to undercross railway frame bridge in soft soil layer.It is essential to ensure the safety of existing railway operations.In order to study the regularity of deformation influencing,by means of numerical analysis,we use MIDAS GTS to build three-dimensional model to analysis the undercrossing railway frame bridge of double-line shield with outer diameter of 6.6 m.The bearing capacity and cracks of existing structures can meet the requirements of the code through calculation.