土体侧移模式对邻近桩基性状影响的三维数值分析

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摘要地下工程开挖对邻近桩基的影响主要是由于开挖引起的土体侧移作用在桩身上,使得邻近桩基产生了附加的桩身位移和弯矩,当土体侧移较大时,可能会对邻近桩基的正常使用产生危害。采用有限元软件 ABAQUS 进行三维有限元分析,将土体位移作为边界条件输入,讨论不同土体侧移模式对于邻近桩基承载和变形性状的影响。数值分析表明,土体侧移模式包括其最大侧移值、分布范围以及分布形状等对桩基的侧移和弯矩均有着不同程度的影响,在实践中应针对不同工程情况予以充分重视。

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	梁发云
	李彦初

关键词 ：土体侧移模式, 被动桩, 承载性状, 桩土接触, 数值分析

Abstract：Effects of underground excavation on the adjacent piles are that the movement of lateral soil on the piles leads to additional pile displacement and bending moment. It may do serious harm to the normal use of adjacent piles when the movement of the lateral soil is large. The 3D finite element software ABAQUS is adopted to study the behavior of passive piles subjected to the movement of the lateral soil by regarding the movement of the lateral soil as the boundary conditions to simplify the process of excavation, and the effects of different modes of lateral movement of soil on pile deflection and bending moment are analyzed. The results from the numerical analysis show that the pile deflection and bending moment are obviously affected by different modes of the lateral movement of soil, such as different maximum displacements, distribution ranges, distribution shapes and so on, which cannot be ignored in practical pile design.

Key words： lateral soil movement passive pile bearing capacity pile-soil contact surface numerical analysis

收稿日期: 2011-08-04

TU47

基金资助:国家自然科学基金资助项目( 50708078)；上海市科技攻关计划资助项目( 10231200500)

作者简介: 梁发云 (1976 – ) ,男,安徽肥东人,博士,副教授,博士生导师,主要从事桩基础、深基坑工程及桥梁冲刷等方面的研究与教学工作。

引用本文:

梁发云, 李彦初, . 土体侧移模式对邻近桩基性状影响的三维数值分析[J]. 岩土工程学报, 2011, 33(sup2): 399-403. LIANG Fa-yun, LI Yan-chu, . Numerical analysis for effects of lateral soil movement on adjacent piles. Chinese J. Geot. Eng., 2011, 33(sup2): 399-403.

链接本文:

http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/ 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2011/V33/Isup2/399

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（本文责编李运辉）