加鳍桩抗扭性能及在推扭受荷群桩中应用

孔令刚; 袁廉华; 蔺港; 陈仁朋; 顾明; 陈云敏

加鳍桩抗扭性能及在推扭受荷群桩中应用 English Version

孔令刚^1,2,
袁廉华^1,2,
蔺港^1,2,
陈仁朋^1,2,
顾明^1,2,
陈云敏^1,2

1.浙江大学岩土工程研究所,浙江杭州 310027；2.浙江大学软弱土与环境土工教育部重点实验室，浙江杭州 310027

基金项目: 国家自然科学基金项目（50809060，50878193）；中央高校基本科研业务费专项资助项目（2011QNA4013，2010xzzx001，2010KYJD006）；浙江省重点创新团队支持计划资助项目（2011R09050）

详细信息

作者简介:
孔令刚(1974– )，男，黑龙江大庆人，副研究员，主要从事桩基工程问题研究。

中图分类号: TU470
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出版历程
- 收稿日期: 2011-11-03
- 发布日期: 2012-08-19

Torsional response of a pile with fins and its application in pile groups under combined lateral and torsional loads

(1. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; 2. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China)

摘要

摘要: 加鳍桩是一种通过在桩身设置侧鳍片或在桩端设置尾鳍片以提高单桩抗扭能力的新型桩形式。圆截面单桩通过桩–土界面摩阻力提供扭转反力，单桩承载力一般较低。加鳍桩通过鳍片挤压土体，从而提升单桩扭转承载力。大尺度模型试验结果表明，桩身增加鳍片使单桩扭转曲线由陡降型变为缓变型，其抗扭刚度和承载力均有显著提高，在3.6°扭转角时扭转反力提高4.7倍。采用数值方法分析加鳍桩在水平偏心加载1×2群桩中的应用效果，分析表明，加鳍桩通过显著减小群桩扭转变形降低了两基桩间内力差异，明显降低群桩中基桩的最大剪力和弯矩，降幅分别达30%和79%，有效提高群桩抵御偏心加载能力。
- 加鳍桩 /
- 大尺寸模型试验 /
- 扭转 /
- 水平偏心荷载 /
- 群桩
Abstract: A pile with fins is a newly developed pile foundation, which is capable of supporting large applied torques. The torsional resistance of the pile with fins is mainly supplied by the fins mounted along the pile shaft and at the bottom of the pile, which is quite different from a circular pile in the load transfer mechanism. Large-scale model tests are performed to investigate the differences between a circular pile and a pile with fins. It is found that the fins on a pile change the applied torque-twist angle curve from a steep drop type to a slow change type and improve the torsional resistance of the pile up to 4.7 times. To investigate the effect of piles with fins on pile groups subjected to eccentric lateral load, a 1?2 pile group with spacing of 3 times the diameter is analyzed using a software GROUP. It is found from the numerical results that the maximum pile-head torsion and bending moment decrease by 30% and 79% respectively as the piles with fins are employed in the group.
- pile with fins /
- large-scale model test /
- torsion /
- eccentric lateral load /
- pile group

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参考文献(12)

[1]	陈仁朋, 王书行, 孔令刚, 等. 不同水平偏心距下群桩内力变化规律试验研究[J]. 岩石力学与工程学报, 2011, 30(3): 603–609. (CHEN Ren-peng，WANG Shu-hang，KONG Ling-gang, et al. Test investigation on distribution of internal forces in pile groups under eccentrically lateral loading[J]. Journal of Rock Mechanics and Engineering, 2011, 30(3): 603–609.(in Chinese ))
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文章访问数: 1312
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加鳍桩抗扭性能及在推扭受荷群桩中应用 English Version

作者简介: 孔令刚(1974– )，男，黑龙江大庆人，副研究员，主要从事桩基工程问题研究。

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出版历程

Torsional response of a pile with fins and its application in pile groups under combined lateral and torsional loads

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出版历程

目录

作者简介:
孔令刚(1974– )，男，黑龙江大庆人，副研究员，主要从事桩基工程问题研究。