紧邻重要建筑深基坑保护性施工技术研究——以南京S8线南延工程大桥站二期基坑施工为例

Research on Protective Construction Technology of Deep Foundation Pit Adjacent to Important Buildings——Taking the Second Phase Foundation Pit Construction of the Bridge Station in Nanjing Line S8 South Extension Project as an Example

轨道交通行业近年来发展迅速,伴随而来的是施工过程中的难题层出不穷,施工环境愈发复杂。文章以紧邻南京长江大桥北引桥双曲拱结构的南京S8线南延工程大桥站二期基坑施工为例,围绕南京长江大桥北引桥双曲拱结构保护工作,对施工设计方案进行调整,采取精细化施工控制措施。同时对大桥站二期基坑施工全周期进行实时监测,结果显示,临桥侧最大土体深层水平位移仅为12.3 mm,对引桥双曲拱结构影响很小。希望文章总结的保护性施工技术能够为后续类似项目施工提供经验参考。

The rail transit industry has developed rapidly in recent years accompanied by endless problems in the construction process and increasingly complex construction environment.Taking the second phase foundation pit construction of the Bridge Station in Nanjing Line S8 South Extension Project,which is adjacent to the double curved arch structure of the north approach bridge of Nanjing Yangtze River Bridge,as an example,this paper adjusts the construction design scheme and adopts refined construction control measures focusing on the protection of the double curved arch structure of the north approach bridge of Nanjing Yangtze River Bridge.At the same time,the real-time monitoring of the whole period of the second phase foun-dation pit construction of the Bridge Station is carried out.The results show that the maximum horizontal displacement of the deep soil layer near the bridge side is only 12.3 mm,which has little effect on the double curved arch structure of the approach bridge.It is hoped that the protective construction technology summarized in this paper can provide experience reference for the construction of similar projects in the future.