高速公路立交桥下穿道路对桥墩桩基的影响分析

An Analysis of the Influence of the Underpass of Expressway Overpasses on the Pile Foundations of Piers

针对滨江北路从莆田西互通立交桥下穿过可能给既有桥梁带来一定安全隐患的问题,对既有桥梁进行安全评估。分析道路施工的不同工况对桥梁桩基产生的影响因素和荷载作用,应用FLAC 3D有限差分软件建立下穿道路与既有桥梁桩基相互作用分析模型,并计算研究不同工况下桩基的地基承载力、内力及变形的大小及其影响程度,最后与相关规范允许值进行比较,分析数据均在安全范围内,满足规范要求。研究结果为本工程施工提供了技术支持,也为同类工程施工提供借鉴。

Considering that Binjiang North Road passing under Putian West Interchange Bridge may lead to insecurity,the paper examines the safety of the existing bridge.Firstly,the influencing factors and load action of road construction under different working conditions on the pile foundations of the bridge are analyzed.Secondly,the FLAC 3D finite difference software is used to establish the interaction analysis model between the underpass road and the pile foundations of the existing bridge,and the bearing capacity and internal forces under different working conditions are calculated and studied along with the deformation of the pile foundations and its influences.Finally,compared with the allowed values of relevant specifications,the analyzed data is deemed safe which meets the standard requirements.The research results not only provide technical support for the construction of this project but also are referential for the construction of future similar projects.