北京超长灌注桩单桩承载特性研究

邹东峰

北京超长灌注桩单桩承载特性研究 English Version

邹东峰

中冶建筑研究总院有限公司，北京 100088

详细信息

作者简介:
邹东峰(1974-)，男，硕士，高级工程师，从事桩基检测方面的研究与工程应用。E-mail: zoudongfeng@sina.com。

中图分类号: TU473.1
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出版历程
- 收稿日期: 2013-02-28
- 发布日期: 2013-07-18

Behaviors of bearing capacity of ultra-long bored piles

ZOU Dong-feng

Central Research Institute of Building and Construction Company, LTD, MCC Group, Beijing 100088, China

摘要

摘要: 对北京CCTV新台址、国贸三期A阶段2个典型试验桩工程进行对比分析，研究了超长灌注桩桩侧、桩端阻力的发挥特性。研究表明：荷载作用下超长桩的桩顶变形主要由桩身的压缩组成，桩端阻力对总承载力的贡献较小；黏土层的桩侧阻力发挥呈加工软化现象，砂性土桩侧阻力发挥呈加工强化现象，且桩侧阻力的发挥存在深度效应；按规范估算的超长灌注桩承载力分布与实际测试结果差异较大。提出采用有效的清渣工艺和后压浆工艺是超长灌注桩的必要措施。
- 超长灌注桩 /
- 试验桩 /
- 桩端阻力 /
- 桩侧阻力
Abstract: Based on the comparison and analysis of the static load tests on the experimental ultra-long bored piles of CCTV Tower and World Trade Center Tower (third stage) in Beijing, the behaviors of the pile tip resistance and the shaft resistance are studied. The results show that the deformation of pile top is mainly from its compression under loads. The tip resistance makes minor contribution to the bearing capacity relative to the shaft resistance. The pile shaft resistance exhibits a softening phenomenon in clay layer and a hardening phenomenon in sandy soil layer, and its play exhibits depth effect. The bearing capacity distribution of piles estimated according to the specifications is greatly different from the test results. Both the effective cleaning residue process and the post grouting means are proposed to be necessary measures for the ultra-long bored piles.
- ultra-long bored pile /
- test pile /
- pile tip resistance /
- pile shaft resistance

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参考文献(1)

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