软土区域超深基坑连接段施工关键技术

Key Technology of the Connection Construction of Ultra-deep Foundation Excavation Engineering in Soft Soil District

在软土区域,为控制基坑变形、确保基坑安全,超大超深基坑多采用分坑分段施工。此类基坑在两端先行完成,最后施工中间的连接段区域。在进行连接段施工时,如何妥善解决支撑、开挖、拆撑及结构对接施工是重难点问题,这对施工技术和管理提出了较高要求,结合南京某深基坑工程的实际情况,分析总结了软土区域超深群基坑连接段施工的多项关键技术。

In soft soil area, in order to ensure safety of the ultra-deep foundation excavation, method of separate excavation and section construction was adopted to avoid the adverse deformation. In such kind of foundation excavation, both ends were advanced finished, and the middle connection district was constructed at last. During the connection construction, it seemed a hard and important problem to deal with the support-layout, excavation, support-removal and structure-connection. So higher demands were proposed for construction technology and management. Combined with the actual operation of some deep foundation excavation in Nanjing, multiple key technologies were eventually analyzed and summarized.