(兰州城投房地产开发有限公司，兰州 730000)

［摘要］通过兰州某交通枢纽项目旋挖钻孔灌注桩静载荷试验与内力测试，分析了该旋挖钻孔灌注桩的荷载传递机理和承载特性。研究表明，桩顶荷载的大部分由桩侧阻力承担，桩端阻力只承担竖向荷载的一小部分；桩侧阻力优先于桩端阻力发挥；荷载沉降（Q-S）曲线呈缓变型；该试验桩的竖向承载力明显高于一般钻孔灌注桩。

［关键词］旋挖钻孔灌注桩；荷载传递；竖向极限承载力

中图分类号：TU473.1文献标识码：A文章编号：1002-848X(2011)03-0092-03

Experimental research on vertical load bearing behavior of churning

driven cast-in-place piles in Lanzhou

Qiu Yingyu

(Lanzhou Metropolitan Real Estate Development Co., Ltd., Lanzhou 730000, China)

Abstract:Based on the results of static loading test and stress test for the churning driven cast-in-place pile in a transportation hub project in Lanzhou, the load transferring mechanism and vertical load bearing behavior of the piles were analyzed. The analysis results show that the vertical load is mainly beared by shaft resistance, and a little part of it is beared by tip resistance. The shaft resistance  works more preferentially than the tip resistance, and the Q-s curve is slow side form. The ultimate vertical load bearing capacity in this test is obviously bigger than that in average case.

Keywords:churning driven cast-in-place pile; load transferring; ultimate vertical load bearing capacity

作者简介：邱英玉，高级工程师，一级注册结构工程师，注册监理工程师，Email：lifuqin1@126.com。

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