CFG桩复合地基增强体偏位影响分析
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（北京市建筑设计研究院有限公司， 北京 100045）［摘要］某工程施工质量检验过程中发现CFG桩复合地基增强体明显偏离设计位置。针对此问题，根据现场CFG桩复合地基增强体单桩静载荷试验、复合地基静载荷试验以及桩间土浅层平板载荷试验的结果，对实际状态下CFG桩复合地基承载力进行了综合分析和评估；同时，采用PLAXIS 3D软件内置的桩单元模拟CFG桩复合地基增强体，分别按设计桩位和施工桩位两种情况建立三维数值模型，进行了地基和基础的协同作用分析，对两种情况下的基础底板的沉降以及基础底板和基础梁的内力进行了对比分析，提出将原设计中为0.9m厚的筏板增加至1.0m厚的处理措施。［关键词］CFG桩复合地基; 桩位偏差; 协同作用; PLAXIS 3D; 三维数值分析中图分类号：TU472 文献标识码：A 文章编号：1002-848X(2014)20-0126-04Analysis on effect of pile deviation in composite foundation with CFG pilesLu Pingzhen, Yu Donghui, Fang Yunfei, Lu Guochang(Beijing Institute of Architectural Design, Beijing 100045, China)Abstract: It was found that CFG piles deviated significantly from the design position in a composite foundation project under construction. According to the static load test on single pile of composition foundation, the static load test of composite foundation and the shallow plate load test on the subsoil surrounding the CFG piles, the bearing capacity of current composite foundation with CFG pile was evaluated. Meanwhile, pile unit built-in PLAXIS 3D was used to simulate CFG pile, and three-dimensional numerical models were see up on conditions of design pile position and construction position respectively to carry out the interaction analysis of foundation and ground. The settlement of foundation slab and internal forces of raft and beams in two conditions were analyzed and compared. The measure of increase raft thickness from 09m to 1.0m was proposed.Keywords: composite foundation with CFG pile; pile position deviation; interaction; PLAXIS 3D; three-dimensional numerical analysis作者简介：卢萍珍，硕士，工程师，Email：51700930@qq.com。参考文献［1］邓日海，罗铁生. CFG桩复合地基在某超高层建筑中的应用［J］. 建筑结构, 2013,43(8):92-96.［2］关伟兰, 李纯仿, 佟建兴, 等. CFG桩复合地基在国美家园工程中的应用［J］. 建筑结构, 2007,37(11):42-44.［3］曹江涛. 某工程CFG桩复合地基质量问题分析［J］. 工程勘察, 2013（11）:32-35.［4］JBJ 79—2012 建筑地基处理技术规范［S］.北京:中国建筑工业出版社,2012.［5］GB 50202—2002建筑地基基础工程施工质量验收规范［S］.北京:中国建筑工业出版社,2002.［6］GB 50007—2011 建筑地基基础设计规范［S］.北京:中国建筑工业出版社,2011.［7］殷辰鹏, 张怀静, 孙宏伟. 多桩型复合地基变形数值计算对比实例分析［J］. 岩土工程技术, 2014,28(2):64-69.［8］高学伸.多元复合地基沉降计算方法研究［D］.武汉：华中科技大学，2007.
