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[1]周雄,汪磊,张自强,等.非对称围护结构基坑开挖影响范围及其对既有狭长基坑的影响研究*[J].中国安全生产科学技术,2024,20(12):112-119.[doi:10.11731/j.issn.1673-193x.2024.12.015]
　ZHOU Xiong,WANG Lei,ZHANG Ziqiang,et al.Study on influence range of excavation of foundation pit with asymmetric envelope structure and its influence on existing narrow-long foundation pit[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2024,20(12):112-119.[doi:10.11731/j.issn.1673-193x.2024.12.015]
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非对称围护结构基坑开挖影响范围及其对既有狭长基坑的影响研究*
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《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
20
期数:
2024年12期
页码:
112-119
栏目:
职业安全卫生管理与技术
出版日期:
2024-12-30

文章信息/Info

Title:
Study on influence range of excavation of foundation pit with asymmetric envelope structure and its influence on existing narrow-long foundation pit
文章编号:
1673-193X(2024)-12-0112-08
作者:
周雄; 汪磊; 张自强; 刘书斌; 侯森祥; 黄金坤; 张红日
（1.上海工程技术大学 城市轨道交通学院，上海 201620；
2.中铁二局集团（上海）建设有限公司，上海 201615；
3.中国十七冶集团有限公司，安徽 马鞍山 243000；
4.广西交科集团有限公司，广西 南宁 545705）
Author(s):
ZHOU Xiong;  WANG Lei;  ZHANG Ziqiang;  LIU Shubin;  HOU Senxiang;  HUANG Jinkun;  ZHANG Hongri
(1.School of Urban Railway Transportation,Shanghai University of Engineering Science,Shanghai 201620,China;
2.China Railway No.2 Engineering Group Shanghai Engineering Co.,Ltd.,Shanghai 201615,China;
3.China MCC17 Group Co.,Ltd.,Maanshan Anhui 243000,China;
4.Guangxi Transportation Science Group Co.,Ltd.,Nanning Guangxi 545705,China)
关键词:
基坑监测; 非对称围护结构; 影响范围; 数值模拟; 狭长基坑
Keywords:
foundation pit monitoring;  asymmetric envelope structure;  influence range;  numerical simulation;  narrow-long foundation pit
分类号:
X947
DOI:
10.11731/j.issn.1673-193x.2024.12.015
文献标志码:
A
摘要:
为研究非对称围护结构基坑施工时，其开挖过程对周围土体和围护结构的影响范围和深度、不同开挖阶段对相邻既有狭长基坑产生叠加影响的范围和具体程度，以上海某交通枢纽基坑工程为案例，对基坑开挖过程监测数据进行分析，并借助有限元方法对新建基坑施工过程及其对既有狭长基坑的影响进行数值模拟。研究结果表明：基坑开挖对周围土体的主要影响范围约为2.2倍基坑开挖深度；围护结构深层水平位移呈现上、中部大，下部小的“勺”形，基坑开挖对围护结构的影响深度为1.6倍开挖深度；新建基坑开挖对既有基坑变形产生叠加影响，且在2坑交界处最大，使得该处变形扩大至原来的3.9倍；第1层土体开挖对既有基坑的影响范围达到既有基坑开挖面积的100%，第2~5层土体开挖的影响范围仅为既有基坑开挖面积的23.4%。研究结果可为非对称围护结构基坑工程开挖影响范围及类似围护结构设计方案提供参考。
Abstract:
In order to study the influence range and depth of the excavation process on the surrounding soil and envelope structure,and the range and specific degree of the superimposed influence of different excavation stages on the adjacent narrow-long foundation pit during the construction of foundation pit with asymmetric envelope structure,taking a transportation hub foundation pit project in Shanghai as a case,the monitoring data of the foundation pit excavation process were analyzed,and the construction process of new foundation pit and its influence on the existing narrow-long foundation pit were simulated by the finite element method.The results show that the main influence range of foundation pit excavation on surrounding soil is about 2.2 times the depth of foundation pit excavation.The deep horizontal displacement of the envelope structure presents a “spoon” shape,which is large in the upper and middle part and small in the lower part.The influence depth of foundation pit excavation on the envelope structure is 1.6 times the excavation depth.The excavation of the new foundation pit has a superimposed effect on the deformation of the existing foundation pit,and the greatest influence appear at the junction of the two pits,which makes the deformation there expand to 3.9 times of the original value.The influence range of soil excavation in the first layer is 100% of the excavation area of the existing foundation pit,while the influence range of soil excavation in the second to fifth layers is only 23.4% of the excavation area of the existing foundation pit.The research results can provide reference for the excavation influence range of asymmetric envelope structure foundation pit engineering and similar envelope structure design schemes.

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备注/Memo

备注/Memo:
收稿日期： 2024-07-01
* 基金项目： 国家自然科学基金项目（12172211）；广西重点研发计划项目（桂科AB23075184）；交通运输行业重点科技项目（2022-MS5-125）
作者简介： 周雄，硕士研究生，主要研究方向为基坑工程。
通信作者： 汪磊，博士，教授，主要研究方向为岩土工程。
更新日期/Last Update: 2024-12-28