复合地基桩体向垫层刺入量模型试验研究

桩体刺入垫层量的分析研究是复合地基沉降和荷载传递规律的一个重要组成部分，它将进一步完善复合地基沉降理论。然而目前对于桩体刺入量的研究不多。为了解具有垫层复合地基的作用机理、掌握桩土的荷载分担及桩体刺入垫层的规律，进行了不同工况的复合地基模型试验，得到了一系列有益的结论。试验结果对复合地基沉降研究提供了理论依据和数据支持，对其设计起到一定的指导作用。

Model Test on the Depth of Pile Penetration into the Cushion of Composite Foundation

Researches on the depth of pile penetration into the cushion of composite foundation is a part of understanding the foundation settlement and load transfer,which would further complete the theory of composite foundation settlement.We performed model tests on composite foundation under different working conditions to obtain the working mechanism of cushioned composite ground,and to investigate the pile-soil stress ratio and the behavior of pile penetration into the cushion.It was found that with the increase of load,the pile-soil stress ratio tended to be stable.When pile diameter increased,the pile-soil stress ratio and the penetration reduced,while the load bearing ratio of pile rarely changed.Therefore,it’s uneconomical to add pile diameter(replacement ratio) to improve the bearing capacity of piles.The rise of cushion thickness helped reduce the pile-soil stress ratio,while intensified the penetration.The test results provide data support for the design of composite foundation.