| 高速铁路超长桥桩承载特性试验研究 |
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| 引用本文： | 任鹏,邓荣贵,于志强.高速铁路超长桥桩承载特性试验研究[J].岩土力学,2010,31(1):174-178. |
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| 作者姓名： | 任鹏 邓荣贵 于志强 |
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| 作者单位： | 西南交通大学 土木工程学院，成都 610031 |
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| 摘 要： | 超长桩广泛已应用于土木工程各个领域，但黄土地区超长桩的承载性状和变形特性尚不十分清楚，需要进一步研究。通过对郑西铁路客运专线某特大桥的4根超长桩现场测试项目的资料分析，得出了超长桩桩身轴力及侧阻力的变化规律，对超长桩的承载特性有了更为清晰的了解。试验结果表明，在桩顶竖向荷载作用下，桩身轴力随荷载的增加发生了局部调整，砂性土层的桩侧摩阻力具有增强效应，黏性土层的桩侧摩阻力具有退化效应；单桩竖向刚度随桩顶荷载的增加而减小，单桩竖向刚度降低40 %～70 %。
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| 关 键 词： | 高速铁路 超长桩 承载特性 桩侧摩阻力 单桩竖向刚度 |
| 收稿时间： | 2008-05-06 |
Research on bearing characteristics of super-long bridge piles for high speed railway |
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| REN Peng,DENG Rong-gui,YU Zhi-qiang.Research on bearing characteristics of super-long bridge piles for high speed railway[J].Rock and Soil Mechanics,2010,31(1):174-178. |
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| Authors: | REN Peng DENG Rong-gui YU Zhi-qiang |
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| Institution: | School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China |
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| Abstract: | The vertical static load test is adopted to investigate 4 super-long bored piles in loess, in which the variation of axial force in piles is tested by vibrating wire strain gauge. Hence, the bearing capacity behavior, load transfer mechanism, the lateral friction and end bearing capacity are researched. With the increasing of vertical static load, the results indicate that: (1) shaft force distribution of bored pile is different from that of original cases; and this difference mainly concentrates on top of 1/3 pile length; (2) enhancing effect of static lateral friction and degradation effect of static lateral friction are obtained in sand soil; (3) the vertical static loading can induce decreasing of axial stiffness of single pile; and (4) axial stiffness of single pile reduces about 40 %-70 %. |
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| Keywords: | high-speed railway super-long bored pile bearing capacity behavior lateral friction axial stiffness of single pile |
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