地铁深基坑邻近市政高架桥支护设计及影响分析

The Support Design and Analysis of the Metro Deep Foundation Pit Near the Municipal Viaduct

地铁深基坑邻近重要市政高架桥,工程风险高,为保障基坑自身及周边环境的安全,提出了针对性围护结构设计;采取加强围护及支撑体系,加长地墙构造配筋段以增加绕流路径并辅助墙缝止水,制订监测专项方案,结合监测结果进行跟踪注浆等措施。通过基坑开挖数值模拟、降水数值模拟及现场监控量测等手段进行验证,该支护设计方案有效地保证基坑及高架桥安全,可为类似邻近建筑物的深基坑设计和施工提供参考。

The subway deep foundation pit is adjacent to the important municipal viaduct with high engineering risk.In order to ensure the safety of the foundation pit itself and the surrounding environment,The pertinence support design were proposed.The support system were reinforced,the underground diaphragm wall were lengthened to increase the by pass path of water and the water stop measures of the joints of underground diaphragm wall were designed,the monitoring special scheme were formulated,and tracking grouting according to the monitoring results.Through the numerical simulation of foundation pit excavation,precipitation numerical simulation and field monitoring measurement,The support design scheme effectively ensured the safety of foundation pit and viaduct,which can provide reference for the design and construction of deep foundation pit similar to adjacent buildings.