厚层黏性土地基上某超高层建筑桩筏基础三维数值分析
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（北京市建筑设计研究院有限公司， 北京 100045）［摘要］工程位于北京市大望京地区，由一栋200m高超高层办公楼、配套裙房及纯地下室组成。采用桩筏基础，地基为北京东北区域典型厚层黏性土，本区域地层有别于北京城区的黏土层与砂卵石层交互循回沉积层，厚层黏性土地基对建筑变形影响较大。基于地基-基础-上部结构的共同作用原理，利用岩土工程数值软件PLAXIS 3D对两种沉降后浇带设置方案进行桩筏基础沉降计算分析，结合施工的便捷性和工程的经济性，选择较合适的沉降后浇带设置方案。并对所选方案进行沉降后浇带封闭前的基础沉降、基础底板内力、基底反力及桩顶反力计算分析，证实了所选方案的可靠性。［关键词］厚层黏性土地基; 超高层建筑; 桩筏基础; PLAXIS 3D; 沉降计算中图分类号：TU473.1 文献标识码：A 文章编号：1002-848X(2014)20-0119-04Three-dimensional numerical analysis on piled raft foundation of a super high-rise building on the thick-layer clay foundationWang Yuan, Li Weiqiang, Sun Hongwei(Beijing Institute of Architectural Design, Beijing 100045, China)Abstract: The project is located in Greater Wangjing area in Beijing and is composed of a 200m high super high-rise office building, matching podiums and basements. Piled raft foundation is applied on the typical thick-layer clay of northeast region of Beijing. The regional strata is different from the clay and sandy pebble layer interaction cycle back to sediments of Beijing city, and such geological conditions impact the building deformation a lot. Based on the interaction principle of soil-foundation-upper structure, the piled raft foundation settlements based on two different post-pouring settlement strip schemes were calculated and analyzed by using the geotechnical engineering numerical simulation software of PLAXIS 3D. Considering with the construction convenience and economy, the better scheme was chosen. The parameters of the chosen scheme before post-pouring strip construction were analyzed and calculated, including foundation settlement, internal forces of foundation base, base reaction and the pile top forces, which verified the reliability of the chosen scheme.Keywords: thick-layer clay foundation; super high-rise building; piled raft foundation; PLAXIS 3D; settlement calculation作者简介：王媛，硕士，工程师，Email: lizzy13@163.com。参考文献［1］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，2012.［2］AHMAD ABDELRAZAQ. 哈利法塔结构性能和响应的验证：足尺结构健康监测方案［J］. 建筑结构，2014，44（5）：85-97.［3］王媛，孙宏伟. 北京Z15地块超高层建筑桩筏基础的数值分析［J］. 建筑结构，2013, 43(17):134-139.［4］史立社. 浅析主楼与裙房的基础联合设计［J］.陕西建筑，2009（1）：56-57.［5］DBJ 11-501—2009北京地区建筑地基基础勘察设计规范［S］.北京：中国计划出版社，2009.［6］BRINKGREV R B J, SWOLFS W M. Manual of PLAXIS 3D foundation ［M］. 2nd ed. Delft：PLAXIS bv，2007.［7］方云飞，孙宏伟，杨洁，等. 北京银河搜候（SOHO）中心地基与基础设计分析［J］. 建筑结构，2013，43（17）：140-143.［8］王媛，孙宏伟，方云飞. 数值软件在地基基础沉降变形计算中的应用与实例［J］. 建筑结构，2013，43（22）：86-90.［9］孙宏伟. 厚层黏性土地基上的高层建筑基础沉降不同计算方法与实测对比分析［J］. 建筑结构，2006，36(S1):21-23.
