为了进一步研究桩基厚承台的受力性能和极限承载能力，共制作了4个缩尺比例为1:10的九桩承台模型试件并进行了竖向破坏性加载试验。对承台的破坏形式、荷载与位移关系、及承台内部应力进行了系统地分析。结果表明，4个承台的破坏形态均为冲切破坏，九桩承台内部力流符合空间桁架模型。此外，采用当前一些常用设计方法对承台的破坏荷载进行计算，并与试验值进行对比，结果表明空间桁架模型设计方法用于厚承台设计更为合理。

The objective of this investigation was to study the behavior of deep pile caps and the ultimate loadcarrying capacity. Four 1/10 scaled models of ninepile caps were cast and tested on vertical loads to failure. The destruction shapes of pile caps, the correlation between load and displacement, and the internal stresses were analyzed systematically. The results demonstrated that the failures of all the four models are resulted from punching shear; the internal flow of the forces in ninepile caps can be approximated by “strutandtie” model. Furthermore, the failure loads of these specimens were predicted by some of the present design methods and the calculated results were compared with the experimental loads. The comparative results also indicated that the “strutandtie” model is a more reasonable design method for deep pile caps design.