（北京市建筑设计研究院有限公司， 北京 100045）

［摘要］北京新机场航站楼建筑规模宏大、主体结构体系复杂、地层土质不均匀、航站楼中心区地下2层设有高铁和地铁车站且高铁等轨道贯穿，因此本工程基础采用基于差异变形控制准则确定的桩筏基础设计方案。通过对勘察报告地层参数指标和试验桩数据的分析，比选确定基桩桩型、桩端持力层与桩长、成桩施工工艺及后注浆工艺参数，考虑基桩-筏板基础-地基协同作用并依据岩土工程数值计算分析结果指导桩基设计方案的调整优化，经过多次反复迭代循环，最终所确定的桩筏基础设计方案满足建筑基础沉降变形控制的严格要求。

［关键词］北京新机场航站楼； 桩筏基础； 差异变形； 桩筏协同作用； 岩土工程数值分析

中图分类号：TU473-1文献标识码：A文章编号：1002-848X(2016)17-0093-06

Design and analysis of pile raft foundation of Beijing New Airport Terminal Building based on differential deformation control

Wang Yuan, Sun Hongwei, Shu Weinong, Fang Yunfei

(Beijing Institute of Architectural Design, Beijing 100045, China)

Abstract:Beijing New Airport Terminal Building has large scale, complex main structural system and uneven stratum and soil conditions. There are a high-speed rail and subway stations  throughout the whole of area of the underground 2nd layer of Terminal Building′s central area. Therefore, in this project, the pile raft foundation design scheme was adopted based on the differential deformation control criteria. Through analyzing the stratum parameter indices and test piles data in survey report, comparison was conducted to determine pile type, pile tip bearing layers and the pile length, pile construction technology and post-grouting process parameters. Pile-raft foundation-soil interaction was considered and the optimization of pile-raft foundation design scheme was guided based on analysis results of geotechnical engineering numerical analysis. After several iteration cycles, ultimately determined pile raft foundation met the stringent requirements of settlement deformation control for the building foundation.

Keywords:Beijing New Airport Terminal Building； pile raft foundation； differential deformation； pile-raft interaction； numerical analysis of geotechnical engineering

作者简介：王媛，硕士，工程师，Email:lizzy13@163.com。