国家体育场桩基水平承载性状的试验研究

针对国家体育场（即“鸟巢”）工程,结构体系复杂,基础桩承受的水平荷载较大的情况,介绍了在国家体育场工程正式施工前进行的水平试桩方案设计思路,并通过分析水平试桩的试验结果,对桩顶为固接和自由状态下的单桩水平承载力及桩身弯矩分布进行了对比,研究了桩土共同工作效应和群桩效应,探讨了地基土水平抗力系数的比例系数m的取值方法。试桩结果不仅为工程桩设计提供了依据,也对控制整个桩基的质量安全起到了重要作用。

Research on Horizontal Bearing Character of National Stadium Piles

The structural system of National Stadium, nicknamed the"Bird's Nest", is complicated and the foundation pile bear heavy horizontal load.This paper introduces the horizontal test pile project design mentality before the national stadium project construction, compares pilehead fixed and free in horizontal bearing capacity and the moment of pile through the analysis of horizontal test pile result, studies pile-soil interaction and pile group effect, and discusses the foundation soil horizontal resisting force coefficient scale-up factor m value method.The test pile result provides a basis for the project pile design and also plays an important role in controlling quality security of the entire pile foundation.