高铁桥梁下明挖隧道施工安全分析

Safety Analysis on Open-cut Tunnel Construction Under Existing High-speed Railway Bridge

为了分析高铁桥梁下明挖隧道施工对运营高铁的影响,以无锡太湖大道节点改造工程为背景,介绍场地的地质条件、基坑支护形式及施工工序,通过对开挖过程中的现场监测数据ABAQUS有限元数值模拟进行对比,重点对高铁桥墩的沉降、围护桩及土体的变形进行分析。结果表明,基坑采用隔离桩围护形式,有效地控制了高铁桥墩及基坑变形,保证了高铁的正常运营。

The effect of open-cut tunnel construction on the operation of existing high-speed railway was analyzed based on the node renovation of Taihu Avenue in Wuxi.The geological conditions,structural types and construction process are introduced.By comparing the monitoring results and the numerical simulation results in the construction process,the settlements of the high-speed railway bridges piers as well as the deformation of fender piles and surrounding ground were analyzed.The result shows that isolation piles can effectively control the deformations of bridge pier and foundation pits,and therefore guarantee the normal operation of the high-speed trains.