（临汾市建筑勘察设计院， 临汾 041000）

［摘要］对于采用框架-核心筒、框架-剪力墙结构的高层建筑以及主裙连体的大底盘基础设计，控制主楼与裙房之间、内筒（或剪力墙）与框架柱之间的差异沉降是地基基础设计的关键，《建筑桩基技术规范》（JGJ 94—2008）的变刚度调平设计、灌注桩后注浆技术为这类问题提供了很好的解决方案。介绍了广奇财富中心二期工程的地基基础设计。桩基设计强化竖向刚度大、竖向荷载集中的主楼内部剪力墙区域，强化指数为1-21，弱化荷载分散的框架柱区域，弱化指数为0-91。主楼的框架柱区域按复合桩基考虑，主楼以外的裙房区域采用天然地基。采用灌注桩后注浆技术使单桩承载力提高约80％。单桩静载试验显示，最大试验荷载下各试桩桩顶沉降很小且数值接近。沉降实测结果表明，建筑物基础总沉降、差异沉降远小于相关规范的变形允许值。变刚度调平设计、灌注桩后注浆技术为工程节约了可观的工程费用，经济效益显著。

［关键词］变刚度调平设计； 灌注桩后注浆； 差异沉降

中图分类号：TU473文献标识码：A文章编号：1002-848X(2018)09-0108-04

Application of techniques on variable stiffness leveling design and post grouting for cast-in-situ pile in Phase Ⅱ Project of Guangqi Fortune Center

An Yiqing

(Linfen City Architectural Survey and Design Institute, Linfen 041000, China)

Abstract:For design of frame-tube, frame-shear structure and large chassis base connecting main buildings and podium, the key to foundation design is to control the differential settlement between the main building and the podium, and between the inner tube (or shear wall) and the frame column, the variable stiffness leveling design and the post-grouting technology for cast-in-situ piles of the Technical code for building pile foundations (JGJ 94—2008) provide a good solution to this problem. The foundation design of Phase Ⅱ of  Guangqi Fortune Center  was introduced. The design of the pile foundation enhanced the shear wall region of the main building with large vertical stiffness and vertical load concentration with the enhanced index of 1-21; the frame column region with distributed load was weakened with the weakening index of 0-91. The frame column area of the main building was considered as a composite pile foundation, and the podium area outside the main building adopted the natural foundation. The use of post grouting technique for cast\|in\|situ pile increased the bearing capacity of single piles by approximately 80%. Single pile static load test shows that the maximum test load settlement of top of each test pile is small and the value is close. The actual settlement test results show that the total foundation settlement and differential settlement of the building are far less than the permissible deformation values of the relevant specifications. The variable stiffness leveling design and post grouting technique for cast-in-situ pile saved considerable engineering costs for the project, resulting in significant economic benefits. 

Keywords:variable stiffness leveling design; post grouting for cast-in-situ pile; differential settlement

作者简介：安一清，本科，总工程师，高级工程师，一级注册结构工程师，Email：18007862@qq.com。