Model test study of single stiffened micropile under cyclic load

QU Jin; SUN Jian-ping; GAO Xiang

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Model test study of single stiffened micropile under cyclic load

更新时间：2026-06-25

- Model test study of single stiffened micropile under cyclic load
- Vol. 32, Issue S2, (2011)
- 作者机构：
  
  山东建筑大学土木工程学院,济南,250101
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU473
- Online First：26 August 2011，
  
  Published：2011
- 稿件说明：
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QU Jin, SUN Jian-ping, GAO Xiang. Model test study of single stiffened micropile under cyclic load[J]. 2011, 32(S2).
DOI：

QU Jin, SUN Jian-ping, GAO Xiang. Model test study of single stiffened micropile under cyclic load[J]. 2011, 32(S2). DOI：

摘要

以1/7比例进行室内模型试验，采用荷载控制加载的拟静力试验方法，通过在桩顶施加侧向循环荷载，对劲性微型桩单桩的滞回曲线、骨架曲线和滞回特性进行研究，同时探讨了循环荷载下劲性微型桩的弯矩分布及破坏机制。研究表明，劲性微型桩在循环荷载作用下荷载-位移关系具有稳定的滞回环，且表现出刚度退化的特性；在上部土体范围内产生桩土脱开效应，滞回曲线发生捏拢现象；桩身弯矩主要集中在桩顶下17 d的范围内，最大弯矩位于桩顶下6 d附近

Abstract

The physical model tests of stiffened micropiles with similarity ratio of 1/7 are carried out. By using the pseudo-static test method in which the force control load and imposing load on the top of the micropile are used

the hysteretic curves

skeleton curves

the hysteretic characteristics

the bending moment and the failure mechanism of single stiffened micropile under circulating load are obtained. The tests results show that

the load-displacement lelation has the stable hysteresis loop and the characteristics of the stiffness degradation; the separation effect between the micropile and soil happened in the upper soil under the lateral cyclic load; and the atrophy phenomenon is found in the hysteresis curve; the bending moment of micropile mainly concentrated within the scope where the distance below the top of the pile is about 17 times diameter of micropile; and the maximum bending moment is located below the top of the pile with the distance about 6 times diameter of micropile .

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