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膨胀土中桩的荷载传递模型试验研究
引用本文:张国强,张春顺,肖宏彬.膨胀土中桩的荷载传递模型试验研究[J].株洲工学院学报,2006,20(4):90-93,96.
作者姓名:张国强  张春顺  肖宏彬
作者单位:湖南工业大学岩土工程研究所,湖南株洲412008
基金项目:国家自然科学基金资助项目(50378097)
摘    要:通过室内模型静载实验,研究和分析了不同荷载下的膨胀土地基中桩的荷载传递特点、桩侧摩阻力和桩端阻力的变化以及二者的荷载分担比例关系等。试验表明:膨胀土中桩的静载试验所得到的P-s曲线存在明显的拐点;桩身轴力随桩顶荷载的增加在桩身中部以上迅速递减,且桩身轴力增加与桩顶荷载增加几乎呈线性关系,桩中部以下几乎变化很小;该模型桩的荷栽传递是以侧摩阻力为主的;桩侧摩阻力和桩端阻力均随桩顶荷载的增加也呈近似线性关系,但桩侧摩阻力和端阻力在荷载分担比方面存在一个极值。

关 键 词:膨胀土  模型试验  荷载传递  荷载分担比
文章编号:1008-2611(2006)04-0090-04
收稿时间:2006-05-07
修稿时间:2006-05-07

Model Test Study on Load Transfer Characteristics of Piles in Expansive Soils
ZHANG Guo-qiang, ZHANG Chun-shun, XIAO Hong-bing.Model Test Study on Load Transfer Characteristics of Piles in Expansive Soils[J].Journal of Zhuzhou Institute of Technology,2006,20(4):90-93,96.
Authors:ZHANG Guo-qiang  ZHANG Chun-shun  XIAO Hong-bing
Affiliation:Institute of Geotechnical Engineering, Hunan University of Technology, Zhuzhou Hun,an 412008, China
Abstract:A model test for a pile in expansive soil is carried out to study and analyze load-transferring characteristics, including the behavior of skin friction and pile-end resistance together with load distribution of both. The test shows a clear turning point occurs in a P-s curve; the axial force above the middle of the pile decreases dramatically and the increment of the axial force is linear with the increment of the applied load,but changes of axial force below the middle of the pile are very small; and the load transferring behavior of the model pile mainly relies on the literal friction resistance. Both the skin friction and the pile-end resistance increase nearly linearly with the increase of the applied loads at the pile-top. As for the bearing ratio in pile side friction and pile-end resistance,an ultimate value may be found.
Keywords:expansive soil  model test  load transfer  bearing ratio
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