锚管复合土钉支护技术在砂卵石地层深大基坑中的应用.pdf

施工技术 2010年1月 90 CONSTRUCTION TECHNOLOGY 第39卷第1期 锚管复合土钉支护技术在砂卵石 地层深大基坑中的应用 王贵和，吕建国，贾苍琴，汪勉涛 (中国地质大学工程技术学院，北京100083) [摘要]北京国美商都属深大基坑支护工程.考虑到场地四周空阔，基坑土层以砂卵石地层为主，密实度高，具有 放坡条件，总体采用错管复合土钉墙支护.介绍支护结构组成，结构及施工工艺.通过现场试验，对基坑的水平位 移以及错管（土钉）的受力特性进行分析.结果表明基坑的水平位移很小，满足设计需求；土钉受力随施工进度逐 渐增大，尤其是退台的设置会引起退台效应，从而起到减荷和使应力重分布的作用. [关键词]基坑；砂卵石地层；支护；错管；复合土钉 [中田分类号]TU753.1 [文献标识码]A [文章编号]1002-8498(2010)01-0090-04 Application of Anchor Pipe Composite Soil Nailing Support Technology in Deep and Large Foundation Excavation in Sand-gravel Stratum Wang Guihe L Jianguo Jia Cangqin Wang Miantao School of Engineering and Technology China University of Geosciences Beijing 100083 China) Abstract:Beijing Gome Shopping City belongs to deep and large foundation excavation engineering. Considering conditions of the project such as wide surrounding building and dense sand-gravel stratum anchor pipe posite soil nailing is adopted as support structure.Composition structure and construction technology of the support structure are introduced.Field investigation of horizontal deformation for foundation excavation and force characteristics for soil nailing are done.The result indicates that the horizontal deformation is small which can meet design requirement;the tensile force of soil nailing grows with the construction process especially at the backslide which causes backslide effect and changing of stress distribution. Key words:foundation excavation;sand and gravel layer;support;anchor pipe;posite soil nailing 在基坑支护工...