大直径灌注桩在软土地区深大基坑应用实践

Application and Practice of Large Diameter Cast-in-Place Pile in Soft Soil Deep and Large Foundation Pit

本文介绍了大直径灌注桩在软土地区某深大基坑工程应用实例。软土地区深大基坑可以选取灌注桩作为支挡结构,但必须合理选取灌注桩刚度和可靠的隔水帷幕。软土地区深大基坑通过设置施工栈桥,采用单向退挖流水施工可以有效的加快基坑施工速度,为建设方节约财务成本,降低资金风险。基坑施工均应遵循"时空效应"原理,合理控制基坑变形水平。

This article describes an application of large diameter cast- in- place pile in soft soil deep foundation pit. The large diameter cast- in- place pile can be used as retaining wall in soft soil deep foundation pit,if the pile rigidity and waterproof curtain are reliable and rational. Some effective measures can be taken,such as setting construction trestle,using water construction technology from one direction to another direction et al,to speed up the foundation pit construction,save financial cost,and reduce the financial risk. The effect of time and space must be observed in foundation pit construction,to control the deformation of the foundation pit reasonably.