（浙江大学建筑设计研究院， 杭州 310028）

［摘要］昆山中宇国际大厦主楼为高204m的框筒混合结构超高层建筑，其一侧与3跨5层的裙房连为一体，采用钻孔灌注桩桩筏基础。在其基础设计中，采用变刚度调平的原理对桩筏进行优化设计，选择合理的布桩平面和筏板厚度，对主楼以及裙房和纯地下室的钻孔灌注桩的桩端持力层和桩长进行合理的配置，同时分析主楼灌注桩桩底后注浆的影响。为控制主楼与裙房的差异沉降，在主楼与裙房之间设置沉降后浇带。通过计算设置后浇带前后的差异沉降并加以对比分析，可以得出设置沉降后浇带能有效控制主楼自身及主楼与裙房的差异沉降的结论，由此改善了筏板的内力并降低了上部结构的次内力，从而减少了桩基础工程量与筏板材料消耗。

［关键词］桩筏基础； 变刚度调平设计； 后注浆钻孔灌注桩； 差异沉降； 沉降后浇带

中图分类号：TU473.1文献标识码：A文章编号：1002-848X(2013)15-0117-05

 

Yu Jinhua, Xiao Zhibin, Liu Zhonghua

（Architectural Design and Research Institute of Zhejiang University, Hangzhou 310028, China）

 

Abstract: Zhongyu International Plaza in Kunshan City is an ultra-limit high-rise building with the height of 204 meters, in which a frame-core wall hybrid system is applied. Part of a five-storey podium is connected to this building. According to the geological conditions, bored pile raft foundation is adopted. In order to optimize the piled raft foundation, variable rigidity design for balance settlement is carried out, including selecting proper pile lay-out, pile length, bearing stratum under pile toe and raft foundation thickness. The influence on the foundation of post grouting in the pile bottom is analyzed as well. As one of the measures to reduce the differential settlement, a post-pouring settlement belt is set up between the main building and the podium. The effect of the belt is evaluated by comparison with the settlement without seting up post-pouring belt. Through those measures above, differential settlement is reduced effectively, that leads to weaken the internal force of the raft foundation and secondary internal force of the superstructure. Thus the quantities of pile foundation and the materials consumption will be decreased.

Keywords: piled raft foundation; variable rigidity design; balance settlement; post-grouting bored pile; differential settlement; post-pouring settlement belt

作者简介：于锦华，硕士，一级注册结构工程师，Email：johua_yu@163.com。

 

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