Comparison test of compression and uplift on pressure-static and grouting micropiles

ZONG Zhong-ling; LU Xian-long; LI Qin-song

doi:10.16285/j.rsm.2018.0548

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Comparison test of compression and uplift on pressure-static and grouting micropiles

更新时间：2026-06-25

- Comparison test of compression and uplift on pressure-static and grouting micropiles
- Vol. 39, Issue S1, Pages: 362-368(2018)
- 作者机构：
  
  1. 淮海工学院土木工程学院,江苏,连云港,222005
  2. 江苏省海洋资源开发研究院（连云港）,江苏,连云港,222005
  3. 中国电力科学研究院,北京,102401
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2018.0548
  CLC： TU473
- Online First：02 September 2018，
  
  Published：2018
- 稿件说明：
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ZONG Zhong-ling, LU Xian-long, LI Qin-song. Comparison test of compression and uplift on pressure-static and grouting micropiles[J]. 2018, 39(S1): 362-368.
DOI：

ZONG Zhong-ling, LU Xian-long, LI Qin-song. Comparison test of compression and uplift on pressure-static and grouting micropiles[J]. 2018, 39(S1): 362-368. DOI： 10.16285/j.rsm.2018.0548.

摘要

通过现场桩基承载力试验，对静压钢管注浆微型桩抗压与抗拔性能进行了对比分析。基于实测Q-s曲线，研究压力注浆工艺及注浆体积比对微型桩抗压极限承载力、抗拔极限承载力以及极限侧阻力的影响，分析注浆微型桩的桩土作用机理，对微型桩抗拔极限状态进行讨论，建议微型桩设计抗拔系数极限抗拔位移。研究结果表明，软土地基中静压钢管注浆微型桩较未注浆钢管微型桩，桩基极限承载力提高显著，桩基抗拔性能良好。

Abstract

Based on the ultimate bearing capacity tests at field site

comparison and analysis between compression and uplift is conducted for pressure-static and post-grouting micropile. A study is carried out in virtue of the Q-s curves to investigate the influence of pressure-grouting process and grouting volume ratios on the bearing capacity and ultimate pile side friction. The pile-soil interaction mechanism and uplift ultimate state is discussed; and then the uplift factor λ and the ultimate uplift displacement are suggested. The results show that compared with micro steel-pipe piles

the ultimate bearing capacity of pressure-static and post-grouting micropiles have been enhanced in soft foundation

especially for the uplift bearing capacity.

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