土工基础

›› 2019, Vol. 33 ›› Issue (2): 194-197.

• 工程实录 • 上一篇    下一篇

等壁厚楔形管桩沉桩效应数值分析

何 杰，陈昱锦，熊 猛   

  1. （湖南工业大学，湖南株洲 412000）
  • 收稿日期:2018-12-02 修回日期:2018-12-19 出版日期:2019-04-20 发布日期:2019-04-22
  • 作者简介:何 杰（1976-），男，教授，博士（后），研究方向为地基与基础工程。
  • 基金资助:

    湖南省自然科学基金资助项目（16JJ5007）

Numerical Analysis of Pile Installation Effect of Tapered Pile with Equal Wall Thickness

HE Jie, CHEN Yujin, XIONG Meng   

  1. （School of Civil Engineering ，Hunan University of Technology, Zhuzhou 412000）
  • Received:2018-12-02 Revised:2018-12-19 Online:2019-04-20 Published:2019-04-22

摘要： 为探讨等壁厚楔形管桩在静力沉桩过程中的沉桩效应，采用PFC2D软件模拟等壁厚楔形管桩在粘性土中的静压沉桩，并对沉桩现象进行分析。得出以下结论，从横向观察所得，随着等壁厚楔形管桩沉桩深度的增加，桩周土表的径向位移随之增大，从纵向观察随着距土表深度的增加，等壁厚楔形管桩桩周土径向位移先增大后减小，最大径向位移出现的位置随着桩的下沉而逐渐向下移动。等壁厚楔形管桩的楔形侧壁对土体有一个法向作用力，增大了桩土间的相互作用，在沉桩过程中对靠近桩侧的土体具有向下"拖拽"的现象。等壁厚楔形管桩周围土体孔隙率逐渐减小，等壁厚楔形管桩周围土体孔隙率变化的范围逐渐增大。

关键词: 楔形管桩, PFC2D, 静压沉桩

Abstract: The Particle Flow Code PFC2D is a generalpurpose distinct element modeling software. This paper presents the simulation of the equal wall thickness tapered pile installation process by static pressin method. The following conclusions can be made: the maximum radial deformation magnitude around the pile increased with the pile installation depth. With the increase of the pile penetration, at the soil radial deformation at the same pile location increased to a maximum value and then decreased. The location of the maximum radial deflection moved downward with the increase of pile penetration depth. Compared with the equal-diameter piles, a higher normal stress acting on the shaft surface of the tapered pile and this higher normal stress increased the pilesoil interactions. The soil surrounding the tapered pile moved downward during the pile installation. With the increase of pile penetration, the porous ratio gradually decreased and the zone soils with porous ratio change increased. 

Key words: tapered pile, PFC2D, static pressedin piles