新建市政道路U形槽下穿高速公路桥梁的安全影响分析

Analysis of the safety influence of Underpassing Municipal Road U-shaped Groove on the Expressway Bridge

为分析新建市政道路U形槽下穿既有高速公路桥梁对高速公路桥梁结构安全的影响,应用PLAXIS软件对下穿段节点方案进行有限元分析,模拟施工阶段U形槽路基开挖及运营阶段交通荷载作用下对既有高速公路桥梁的影响,结果表明,项目施工及运营过程中,对既有高速公路在各方向的位移量均小于规范允许值,满足安全要求。

In order to analyze the influence of new municipal road U-shaped groove underpassing existing expressway bridge on the safety of expressway bridge structure,PLAXIS software was used to conduct finite element analysis on the node scheme of underpassing section,and simulate the influence of U-shaped groove subgrade excavation in construction stage and traffic load on existing expressway bridge in operation stage.The results show that,in the process of project construction and operation,the displacements of existing expressways in all directions are all less than the allowable values in the specifications,which meets the safety requirements.