（北京交通职业技术学院路桥系， 北京 102200）

［摘要］通过模型试验模拟预应力悬臂桩的变形形态，分析了模型板嵌固长度、模型板厚度、土面处水平位移的改变对其嵌固段变形形态和土面处水平推力的影响。结果表明，支护结构出现“踢脚”型、“转动”型、“嵌固”型三种变形形态；为达到控制位移的目的，应设计为“嵌固”型的预应力支护结构；对于“嵌固”型的支护结构，即使支护结构已发生较大位移，支护结构的抗水平荷载能力仍随位移增加而继续增长，同时增加嵌固长度不能有效提高支护结构抗水平荷载的能力。试验结果对于改善支护结构性状，减小变形，节约工程造价和保护环境，具有一定的工程应用价值。

［关键词］基坑工程； 悬臂桩； 预应力； 模型试验

中图分类号：TU398-7文献标识码：A文章编号：1002-848X(2020)23-0118-05

Model test study on deformation behavior of prestressed cantilever pile

YANG Wensheng

(Road & Bridge Department, Beijing Traffic Vocational Technical College, Beijing 102200, China)

Abstract:Through model test, the deformation of prestressed cantilever pile was simulated, and the influence of embedded length of the model plate, the thickness of the model plate and the horizontal displacement at the soil surface on the deformation of the embedded segment and the horizontal thrust at the soil surface were analyzed. The results show that supporting structure has three deformation forms: “kicking” type, “rotating” type, and “embedded” type. In order to control the displacement, the "embedded" type prestressed supporting structure should be designed.  For "embedded" type supporting structure, the horizontal load-resisting capacity of the supporting structure increases with increase of the displacement, even though the displacement of the supporting structure has already been larger, at the same time, increasing the embedded length can not effectively improve the horizontal load-resistance of the supporting structure. The test results have certain engineering application value for improving behavior of supporting structure, reducing deformation, saving engineering cost and protecting environment.

Keywords:foundation pit engineering; cantilever pile; prestress; model test

*北京市自然科学基金资助项目（8192050）。

作者简介：杨文生，硕士，副教授，Email:xlydjs@163.com。