中南大学学报(英文版)2023，Vol.30Issue(12) ：4168-4181.DOI:10.1007/s11771-023-5489-z

各向异性黏土中的深基坑开挖单撑失效数值模拟研究

Numerical analysis of one-strut failure in deep braced excavation considering anisotropic clay behavior

仉文岗 胡鑫芸 章润红 陈春霞 黎泳钦 叶文煜 张智超 陈荣淋
中南大学学报(英文版)2023，Vol.30Issue(12) ：4168-4181.DOI:10.1007/s11771-023-5489-z
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  • 维普
  • 万方数据

各向异性黏土中的深基坑开挖单撑失效数值模拟研究

Numerical analysis of one-strut failure in deep braced excavation considering anisotropic clay behavior

仉文岗 1胡鑫芸 1章润红 2陈春霞 3黎泳钦 1叶文煜 1张智超 4陈荣淋5
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作者信息

  • 1. School of Civil Engineering,Chongqing University,Chongqing 400045,China
  • 2. MOE key Laboratory of High-speed Railway Engineering,Institute of Smart City and Intelligent Transportation,Southwest Jiaotong University,Chengdu 611756,China
  • 3. China Southwest Geotechnical Investigation&Design Institute Co.,Ltd.,Chengdu 610093,China
  • 4. Key Laboratory of Geohazard Prevention of Hilly Mountains,Ministry of Natural Resources of China,Fuzhou 350021,China
  • 5. School of Civil Engineering,Chongqing University,Chongqing 400045,China;Institute for Smart City of Chongqing University in Liyang,Chongqing University,Changzhou 213300,China
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摘要

近年来,随着基坑建设深度需求的不断增大,多道支撑式支护体系的使用大幅增长,而结构局部连接失效导致内支撑体系渐进失效破坏的案例时有发生.针对该工程问题,以往的研究通常将土体理想化,忽略了土体力学特性存在各向异性的特征,导致计算结果存在一定的偏差.本文基于天津某地铁车站基坑项目,采用NGI-ADP土体本构模型考虑土体的各向异性,建立三维有限元模型模拟不同初始位置单撑失效(OSF),通过荷载转移率和荷载增加率这两个指标,量化单撑失效后基坑支撑系统的受力变化.分析结果表明:土体的各向异性对支撑轴力的影响不容忽视;同一道支撑的不同初始位置单支撑失效后,基坑支撑的轴力响应是相似的;单撑失效后,在失效支撑附近荷载传递存在就近现象,主要在竖直方向上传递大幅荷载.

Abstract

In recent years,with the rapid development of braced excavation supported by multi-level struts,cases of continuous failure caused by local failure of braced excavation occur frequently.However,in previous studies,soil is usually idealized,and anisotropy is ignored,leading to a certain deviation in the results accuracy.Based on a subway braced excavation in Tianjin,this paper adopted the NGI-ADP soil constitutive model to consider soil anisotropy and established a 3D finite element model to simulate the one-strut failure(OSF)at different positions,which is regarded as the triggering factor for several progressive excavation failure case histories.The axial force response of support system after OSF was quantified by load transfer rate and load increase rate.The results showed that the influence of soil anisotropy on the struts axial force cannot be ignored.The response of the support system is similar when the one-strut fails in the middle of the same level struts.After OSF,there is a nearby load transfer phenomenon and mainly in the vertical direction.

关键词

单撑失效/深基坑/各向异性/NGI-ADP模型/有限元分析

Key words

one-strut failure/braced excavation/anisotropy/NGI-ADP model/finite element analysis

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基金项目

Research Funds for the Key Laboratory of New Technology for Construction of Cities in Mountain Area,China(09020718120007)

National Natural Science Foundation of China(52078086)

Innovation Group Science Foundation of the Natural Science Foundation of Chongqing,China(cstc2020jcyjcxttX0003)

National Natural Science Foundation of China(2023J06039)

Fujian Science Foundation for Distinguished Young Scholars,China(41977259)

出版年

2023
中南大学学报(英文版)
中南大学

中南大学学报(英文版)

CSTPCDCSCDEI
影响因子：0.47
ISSN：2095-2899
参考文献量6
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