成盘方法不同对支盘桩工程性状的影响探讨

介绍了新型变直径灌注桩—挤扩支盘桩和旋扩珠盘桩的工作原理及主要优缺点和施工技术要点。设计了模拟挤扩和旋扩成盘的模型试验方案并进行了对比模型试验,根据模型试验结果分析比较了挤扩和旋扩这两种不同施工方法对变直径桩承载力和变形的影响,挤扩桩由于"挤密效应"使桩的承栽力和抗变形能力得到较大提高。同时还讨论了它们在荷载传递上的区别,在设计和施工时应充分注意各自的特点。

Discussion on the Influence to Engineering Behavior of Piles with Plates Formed by Different Construction Methods

The working principle,main advantages and construction key points for the new type diameter-changing cast-in-place piles which are formed with plates by compaction and by incision are introduced.The model testing scheme for simulating the compaction and incision has been designed and the model tests have been carried out. According to the results from the model tests,the influence from the two different construction ways of compaction and incision to the bearing capacity and the deformation of the diameter-changing piles are analyzed.The piles with plates by compaction are better than the piles with plates by incision for the bearing capacity and anti-deformation, and their differences in load transfer are also discussed.During the design and construction of the piles,their own characteristics should be paid attention to.