盆、岛式交替开挖在锚索围护基坑中的应用

Application of Basin and Island Type Alternative Excavation in Foundation Pit with Anchor Cable Retaining Support

以深圳大学西丽校区建设工程(二期)项目Ⅱ标段深基坑施工为例,针对超大型桩-锚索围护结构基坑土方开挖方案进行了研究。提出了盆、岛式交替开挖配合预应力锚索施工的开挖方案,解决了土方施工需等待围护结构施工的问题。通过建立三维有限元数值模型,分析了该挖土方案对围护结构变形的影响。根据施工数据,对该方案的开挖效率、围护变形、优缺点等进行了分析研究,可为类似工程提供借鉴。

Taking the deep foundation pit construction of bid section Ⅱ of Xili campus construction project(phase Ⅱ) of Shenzhen University as an example, the earthwork excavation scheme of foundation pit with super large pile anchor cable retaining support structure is studied. The excavation scheme of basin and island type alternative excavation combined with prestressed anchor cable construction is put forward, which solves the problem that earthwork construction needs to wait for the construction of retaining support structure. By establishing a 3D finite element numerical model, the influence of the excavation scheme on the deformation of the retaining support structure is analyzed. According to the construction data, the excavation efficiency, retaining support deformation, advantages and disadvantages of this scheme are analyzed and studied, which can provide reference for similar projects.