基坑开挖对单桩及群桩回弹位移的影响分析

吉林大学学报(地球科学版)

基坑开挖对单桩及群桩回弹位移的影响分析

卫凌云¹，秦胜伍²，陈慧娥²

1.中国建筑东北设计研究院有限公司，沈阳110006;
2.吉林大学建设工程学院，长春130026

收稿日期:2013-05-05 出版日期:2014-03-26 发布日期:2014-03-26
通讯作者: 秦胜伍（1980-），男，副教授，博士，主要从事工程地质、岩土工程的教学科研工作 E-mail:qinsw@jlu.edu.cn
作者简介:卫凌云(1981-)，男，工程师，主要从事岩土工程方面的勘查、设计和施工工作，E-mail:weilingyun2993@sina.com
基金资助:
国家自然科学基金项目(40902077，41202197)

Analysis on Rebounding Displacement of Single Pile and Pile Group Under Excavation

Wei Lingyun¹,Qin Shengwu²,Chen Huie²

1.China Northeast Architectural Design & Research Institute Co., Ltd. Shenyang110006, China;
2.College of Construction Engineering, Jilin University, Changchun130026, China

Received:2013-05-05 Online:2014-03-26 Published:2014-03-26

摘要/Abstract

摘要：

基坑开挖后坑底土体回弹，将会带动坑内基桩回弹，并在桩侧产生侧摩阻力。为了分析基坑开挖条件下单桩及群桩的受力变形特性，采用三维有限元方法对单桩及群桩在基坑开挖条件下的回弹位移进行了分析。分析结果表明，基桩在基坑开挖条件下的回弹位移分为桩侧土体回弹而引起的基桩回弹和下卧层回弹导致的基桩回弹两部分。由于群桩外侧桩的遮帘效应，中心桩的回弹位移小于外侧桩，中心桩桩侧摩阻力的发挥量也小于外侧桩。随下卧层相对刚度E_b/E_c变大，5×5群桩回弹位移相对减小量W_r变大，且W_r的变化与桩位置有关。3种不同构形群桩的对比分析结果表明:群桩桩数越多，遮帘效应越明显;W_r受桩数的影响大于受桩间距的影响。

关键词: 基坑开挖, 回弹位移, 单桩, 群桩

Abstract:

Pit soil rebounding during excavation will cause piles rebound and produce lateral friction in pit.Three-dimensional finite element analysis method was conducted to study the behavior of single pile and pile group under excavation. Results show that the rebounding displacement of single pile can be divided into two parts, namely, one is caused by the rebounding of soil around the pile and the other is caused by the rebounding of the bearing layer. The rebounding displacement and the degree of lateral friction of central pile were reduced by the shielding effects of outer piles. The relative reduction in rebounding displacement in 5×5 pile group increased with the increase of relative bearing stiffness ratio, and this kind of variation depended on the pile location in the group. Based on three cases studied, the larger the number of piles in a group, the greater the shielding effects presented. The number of piles had greater influence on shielding effect than pile spacing.

Key words: excavation, rebounding displacement, single pile, pile group

中图分类号:

TU433

卫凌云，秦胜伍，陈慧娥. 基坑开挖对单桩及群桩回弹位移的影响分析[J]. 吉林大学学报(地球科学版), 2014, 44(2): 584-590.

Wei Lingyun,Qin Shengwu,Chen Huie. Analysis on Rebounding Displacement of Single Pile and Pile Group Under Excavation[J]. Journal of Jilin University(Earth Science Edition), 2014, 44(2): 584-590.

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