CFG桩复合地基与钢筋混凝土筏板基础设计
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（中冶建筑研究总院有限公司， 北京 100088）
［摘要］对于高层建筑钢筋混凝土筏板基础设计，通常将弹性地基梁法的计算结果与简化的倒楼盖法计算结果相比较，采用综合取值的设计方法，其核心就是如何提高地基变形计算的精确性。通过对上部结构筏板基础与地基的共同作用概念及机理的论述和探讨，并在已有实测结果统计分析的基础上，分别对高层建筑CFG桩复合地基和筏板基础的受力和变形原理进行分析，提出CFG桩复合地基与筏板基础设计时，按现有CFG桩复合地基变形计算理论并考虑上部结构-筏板基础-地基共同作用和土层厚度分布影响的CFG桩复合地基变形计算的改进方法。采用该改进方法对某实际工程的CFG桩复合地基变形进行了计算，其计算结果与该工程沉降观测值大小及其分布规律基本一致。［关键词］CFG桩复合地基; 钢筋混凝土筏板基础; 共同作用; 变形计算; 改进方法中图分类号：TU473 文献标识码：A 文章编号：1002-848X(2016)08-0053-08
Design of CFG pile composite foundation with reinforced concrete raft foundationDang Yujing（Central Research Institute of Building and Construction MCC, Beijing 100088, China）Abstract: In reinforced concrete raft foundation design of high-rise buildings, the calculation results of elastic foundation beam method are usually compared with that of the simplified down floor calculation method. Raft foundation design method with comprehensive value is adopted with the core of improving the calculation accuracy of the foundation deformation. The concept and mechanism of interaction of superstructure, raft foundation and foundation were discussed, and principles of mechanism and deformation of CFG pile composite foundation and raft foundation of high-rise buildings were analyzed respectively based on the statistical analyses of existing experimental results. It was proposed that in CFG pile composite foundation and raft foundation design, improved method of deformation calculation of CFG pile composite foundation should consider deformation concept of CFG pile composite foundation and influences of interaction between superstructure, raft foundation and foundation as well as soil layer distribution. The improved method was adopted in calculation of CFG pile composite foundation deformation in a practical engineering and calculation results are basically consistent with observed settlement value and distribution law.Keywords: CFG pile composite foundation; reinforced concrete raft foundation; interaction; deformation calculation; improved method
作者简介：党昱敬，教授级高级工程师，注册土木工程师（岩土），Email:dyj765@sina.com。
