A new load transfer model of super-long pile

YAO Wen-juan; CAI Chen-yu

doi:10.16285/j.rsm.2016.S2.099

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A new load transfer model of super-long pile

更新时间：2026-06-25

- A new load transfer model of super-long pile
- Vol. 37, Issue S2, Pages: 783-787(2016)
- 作者机构：
  
  上海大学土木工程系,上海,200072
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2016.S2.099
  CLC： TU473.1
- Online First：09 June 2018，
  
  Published：2016
- 稿件说明：
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YAO Wen-juan, CAI Chen-yu. A new load transfer model of super-long pile[J]. 2016, 37(S2): 783-787.
DOI：

YAO Wen-juan, CAI Chen-yu. A new load transfer model of super-long pile[J]. 2016, 37(S2): 783-787. DOI： 10.16285/j.rsm.2016.S2.099.

摘要

超长桩桩侧摩阻力出现软化是一个较为普遍的现象。针对超长桩出现的侧摩阻力软化现象，提出了一种新的双曲荷载传递函数，该传递函数充分考虑了桩土相互作用的非线性特性和软化特性。依据新的荷载传递函数，利用FORTRAN语言编写了UMAT子程序。通过实例计算，对比了现场试验数据、ABAQUS自带接触对的计算结果和ABAQUS应用文中子程序后的计算结果，结果表明ABAQUS应用文中子程序计算所得的桩顶Q-s曲线、桩侧摩阻力分布曲线和桩侧摩阻力与桩土相对位移关系曲线都与现场试验数据更加吻合，证明文中提出的荷载传递函数可以有效地模拟超长桩桩土相互作用的非线性特性和软化特性，并且对超长桩承载力的估算更加合理可靠。

Abstract

The decrease of pile’s skin friction of super-long pile is a common phenomenon. In this study

a new hyperbolic load transfer model which includes the stage of decrease of pile’s skin friction is proposed. The characteristics of nonlinear and decrease of the interaction of pile and soil is fully considered in this model. Furthermore

a UMAT subprogram is compiled in FORTRAN on the basis of the new model. Based on a history case

a comparison among situ data

the results calculated by the origin contact analysis in ABAQUS and the results adopting the procedure developed in this paper. It is shown that

the curves of Q-s relationship of pile’s top

the distribution of pile’s skin friction and the relationship of pile’s skin friction versus pile-soil relative movement are more consistent with field test data. It is proved that by adopting the load transfer model in this paper

the nonlinear characteristic and decrease of pile’s skin friction is well simulated of the interaction of pile and soil. Also

the estimation of the capacity of the pile is more reliable.

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