中国尊大厦桩筏协同作用计算与设计分析
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（北京市建筑设计研究院有限公司， 北京 100045）［摘要］梳理总结了北京中国尊超高层建筑桩筏基础设计创新的技术思路和设计成果，应用土与结构相互作用原理，将主塔楼与其相邻裙房作为一个整体进行研究与分析，遵循差异沉降控制与协调的设计准则，设计过程中桩筏协同作用的三维数值分析与桩基础设计密切结合。通过试验桩载荷试验研究超长钻孔灌注桩的荷载传递规律、荷载沉降的工程性状、侧阻力变化特征，考虑桩筏协同作用按变形控制条件合理选择桩端持力层，优化设计桩长、桩径和桩间距，桩基础结构设计计算考虑上部结构、筏板基础和地基（桩与土）共同作用分析。岩土工程师与结构工程师通力协作的团队工作完成了桩筏基础设计优化，超高层主塔楼与裙房之间不再设置沉降后浇带，实现了桩筏设计的创新。［关键词］中国尊; 超高层建筑; 桩筏基础; 协同作用; 超长钻孔灌注桩; 沉降计算中图分类号：TU473.1 文献标识码：A 文章编号：1002-848X(2014)20-0109-06Calculation and analysis of piled raft foundation interaction of China ZUN TowerSun Hongwei, Chang Weihua, Gong Zhenchao, Wang Yuan（Beijing Institute of Architectural Design, Beijing 100045, China）Abstract: The technical ideas and design achievements of piled raft foundation design innovations for super tall building of China ZUN Tower in Beijing were summarized. Based on soil-structure interaction principle, the main tower and its podiums were analyzed as a whole according to the design principle of control and coordination of differential settlement. Combination of 3D numerical analysis of piled raft foundation interaction and pile foundation design were accomplished during the design process. Pile load tests were carried out to study load transfer laws, load-settlement behavior and variation characteristics of shaft resistance of super-long bored piles. Considering piled raft foundation interaction for piled raft foundation, reasonable bearing stratum of pile end was selected according to deformation controlling conditions and optimization designs of pile length, pile diameter and pile spacing were carried out. Structural design of pile foundation should consider the interaction of superstructure, raft foundation and foundation (pile and soil). The efficient teamwork of geotechnical engineers and structural designers had play a very important role on achieving innovation in piled raft foundation design and optimization. The post-pouring settlement strip was not set between the main tower and podiums, which realized the innovation in piled raft foundation design.Keywords:China Zun; super tall building; piled raft foundation; interaction; super-long bored pile; settlement calculation作者简介：孙宏伟，副总工程师，教授级高级工程师，注册土木工程师（岩土），Email：dijiyanjiu@163.com。参考文献［1］张在明. 北京地区高层和大型公用建筑的地基基础问题［J］. 岩土工程学报, 2005，27(1): 11-23.［2］汪大绥, 姜文伟, 包联进, 等. CCTV新台址主楼结构设计与思考［J］. 建筑结构学报，2008，29（3）：1-9.［3］邹东峰，钟冬波，徐寒. CCTV新址ɸ1 200钻孔灌注桩承载特性研究［C］//桩基工程技术进展（2005）.北京：知识产权出版社，2005：90-96.［4］王卫东，李永辉，吴江斌. 上海中心大厦大直径超长灌注桩现场试验研究［J］. 岩土工程学报，2011（12）：1817-1826.［5］孙宏伟. 京津沪超高层超长钻孔灌注桩试验数据对比分析［J］. 建筑结构， 2011，41(9)：143-146.［6］张忠苗，张乾青，张广兴，等.软土地区大吨位超长试桩试验设计与分析［J］. 岩土工程学报，2011, 33(4)：535-543.［7］穆保岗, 龚维明, 黄思勇. 天津滨海新区超长钻孔灌注桩原位试验研究［J］. 岩土工程学报, 2008,30(2): 268-271.［8］孙宏伟，沈莉，方云飞，等. 天津滨海新区于家堡超长桩载荷试验数据分析与桩筏沉降计算［J］. 建筑结构，2011，41(S1)：1253-1255.［9］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.［10］HARRY G POULOS. Tall buildings and deep foundations-Middle East challenges［C］// Proceedings of the 17th International Conference on Soil Mechanics and Geotechnical Engineering, 2009：3173-3205.
