浅谈砂卵石地层盾构下穿铁路框构桥桥体影响分析

Analysis of the Influence of the Shield Tunnel in the Sandy Cobble Stratum Underpassing the Railway Frame Bridge

沈阳地铁九号线皇-北盾构区间下穿兴华北街公铁框构桥,框构桥上部为铁路线路(沈山乙线、京哈上行、京哈下行、沈山甲线、3条动车组停车线),线路密集,施工过程桥梁变形控制难度大,下穿框构桥时,盾构推进扰动土体将给铁路线路带来不利影响,考虑到施工安全,在盾构下穿桥梁前对扰动桥梁结构土体产生桥梁的影响进行模拟分析,通过模拟在施工中采取有效措施控制桥梁结构变形,确保铁路线路运行安全。

The Shenyang Metro Line 9 Huang-Bei Shield tunnel section passes through the Xinghua North Street public railway frame bridge.The upper part of the frame bridge is the railway line(Shenshan Line B,Jingha Uplink,Jingha Downlink,Shenshan Line A,3 EMUs Parking lines).With dense lines,it is difficult to control bridge deformation during construction.When underpassing the framed bridge,the disturbance of soil caused by shield advance will adversely affect the railway line.In consideration of construction safety,the impact of the disturbance of the bridge structure soil on the bridge is simulated and analyzed,and effective measures are taken to control the deformation of the bridge structure during the construction to ensure the safety of the railway line operation.