| 下卧层刚度对CFG桩复合地基承载特性的影响研究 |
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| 引用本文： | 田兆斌,岳荷,马学宁.下卧层刚度对CFG桩复合地基承载特性的影响研究[J].路基工程,2014,0(5):110-114. |
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| 作者姓名： | 田兆斌 岳荷 马学宁 |
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| 作者单位： | 兰州交通大学土木工程学院, 兰州 730070 |
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| 摘 要： | 结合某高速铁路CFG桩加固湿陷性黄土地基的工程实例,采用室内模型试验和数值模拟的方法,研究了下卧层刚度对CFG桩复合地基承载特性的影响.通过模型试验,获得了天然地基、悬浮式和支承式CFG桩复合地基的P-S曲线以及桩土应力比曲线.采用有限元分析软件,模拟以上三种工况在路堤荷载作用下的位移和桩土应力比.模型试验表明:下卧层刚度对湿陷性黄土CFG桩复合地基沉降影响效果显著,支承式CFG桩复合地基的桩土应力比更大.数值模拟与模型试验的结果基本一致,二者可以相互印证.
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| 关 键 词： | CFG桩 模型试验 数值模拟 湿陷性黄土 碎石 下卧层刚度 |
| 收稿时间： | 2019-11-06 |
Study on Influence of Underlayer Stiffness on Bearing Behavior of CFG Pile Composite Foundation |
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| Authors: | TIAN Zhaobin YUE He MA Xuening |
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| Affiliation: | (School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China) |
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| Abstract: | Based on an engineering example of CFG pile reinforced collapsible loess foundation for a high speed railway,this paper,by the methods of laboratory model test and numerical simulation,studied the influence of underlayer stiffness on the bearing behavior of CFG pile composite foundation.Through the model test,the P-S curves and pile-soil stress ratio curves of natural foundation,floating and end-bearing CFG pile composite foundation were developed; in other hand,with finite element analysis software,the displacement and pile-soil stress ratio under the action of embankment loading in the aforesaid three cases were simulated.The results of the model test show that underlayer stiffness has significant effect on CFG pile collapsible loess composite foundation,and the pile-soil stress ratio of end-bearing CFG pile composite foundation is greater.The result from the numerical simulation agrees with that from the model test substantially,thus the both may be validated each other. |
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| Keywords: | CFG pile model test numerical simulation collapsible loess macadam underlayer stiffness |
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