填海区淤泥地层盖挖逆作地下结构桩基设计与施工关键技术  

KEY TECHNOLOGY OF PILE FOUNDATION DESIGN AND CONSTRUCTION FOR TOP-DOWN CONSTRUCTION OF UNDERGROUND STRUCTURE IN SILT STRATUM OF RECLAMATION AREA

作　　者：李文武[1] 张驰 Li Wen-wu;Zhang Chi

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《建筑技术开发》2022年第6期154-158,共5页Building Technology Development

摘　　要：大面积填海区淤泥地层基坑变形较难控制,支撑设置较难处理,盖挖逆作工法可以有效解决这个问题。淤泥地层天然含水率高、孔隙比大,地基处理的工法或施工控制不当,容易产生较大的工后沉降,导致运营期间难以整改。以深圳地铁13号线内湖停车场项目为背景,重点针对填海淤泥地层盖挖逆作地下结构桩基受力分析、桩基施工工艺、临时立柱兼永久柱施工精度控制等关键问题进行了研究,构建了针对深厚淤泥地区基坑“盖挖逆作+疏桩基础+复合地基”的综合安全技术体系,盖挖逆作工法确保了深大基坑的水平变形控制要求;疏桩基础+复合地基既解决了淤泥施工过程承载力要求,以及盖挖逆作工法的承载力要求,同时满足地下停车场运营期间的承载力和沉降变形要求,研究成果可为同类工程提供参考借鉴。It is difficult to control the deformation of the foundation pit and to deal with the support in the silt stratum in the large-area reclamation area. Due to the high natural water content, large pore ratio and improper foundation treatment or construction control, large post-construction settlement is easy to occur, which makes it difficult to rectify during operation. Based on the Shenzhen Metro Line 13 Neihu parking lot project, the paper focuses on the study of the key problems such as the stress analysis of the deep foundation underground structure,the construction technology of the pile foundation, the construction precision control of the temporary column and the permanent column, etc., and a comprehensive safety technical system of "top-down construction + sparse pile foundation + composite foundation" for foundation pit in deep and thick silt area is constructed, and the sparse pile foundation + composite foundation not only solves the requirements of the bearing capacity during the construction of silt and the top-down construction method, but also satisfies the requirements of the bearing capacity and settlement deformation during the operation of the underground parking lot. The research results can provide reference for similar projects.

关 键 词：盖挖逆作 填海淤泥地层 桩基受力 临时立柱兼永久柱 精度控制 沉降控制 

分 类 号：TU473.1[建筑科学—结构工程]