考虑基桩影响的粉砂地基深基坑流砂模型试验研究.pdf

文档介绍：第 26 卷第 10 期岩石力学与工程学报 Vol . 26 No. 10
2007 年 10 月 Chinese Journal of Rock Mechanics and Engineering Oct.,2007



考虑基桩影响的粉砂地基深基坑
流砂模型试验研究

胡琦,凌道盛,詹良通,陈云敏,贾官伟,罗耀武
(浙江大学建筑工程学院,浙江杭州 310027)

摘要:采用自制的基坑工程渗流、渗透破坏模型试验装置,通过对水头与土体变形的观测,研究均质砂土与粉土
地基基坑工程中考虑基桩影响的渗透破坏问题,揭示基坑工程土体渗透破坏模式。结合有限元数值模拟分析,从
土体应力状态改变的角度研究基坑工程的渗透破坏机制,并分析基桩对土体渗透破坏的影响以及渗流对基桩受力
变形的影响。研究成果表明,受渗透力的作用,围护结构底部土体首先进入塑性状态,当坑内土体形成贯通的塑
性区时,即发生渗透破坏。在均质地基中,其模式为楔形体破坏。受黏聚力的影响,粉土破坏时的水头差较砂土
大,同时基桩的影响也会增大破坏时的水头差。
关键词:基础工程;模型试验;有限元;渗透破坏;临界水力坡降;深基坑;侧摩阻力
中图分类号:TU 47 文献标识码:A 文章编号:1000–6915(2007)10–2153–08

MODEL EXPERIMENTS ON SEEPAGE FAILURE OF
DEEP FOUNDATION PIT CONSIDERING INFLUENCE OF
FOUNDATION PILES IN SANDY SOIL

HU Qi,LING Daosheng,ZHAN Liangtong,CHEN Yunmin,JIA Guanwei,LUO Yaowu
(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou,Zhejiang 310027,China)

Abstract:Using home-made seepage and seepage failure test apparatus,model experiments in different conditions
were carried out. Based on the analysis of water head and soil deformation results,the seepage failure problem of
deep foundation pit in uniform sandy and silty soil is investigated. The results demonstrate the seepage failure
modes in deep foundation pit in uniform sandy and silty soil. Combined with numerical simulation and model
experiments,the mechanism of seepage failure is ana