[1]胡增辉.某滨海城市地铁基坑变形及影响因素分析[J].华南地震,2023,(02):174-184.[doi:10.13512/j.hndz.2023.02.20]
　HU Zenghui.Analysis of Deformation and Influencing Factors of Subway Foundation Pit in a Coastal City[J].,2023,(02):174-184.[doi:10.13512/j.hndz.2023.02.20]
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某滨海城市地铁基坑变形及影响因素分析()
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华南地震[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2023年02期
页码:
174-184
栏目:
土木工程防震减灾
出版日期:
2023-06-20

文章信息/Info

Title:
Analysis of Deformation and Influencing Factors of Subway Foundation Pit in a Coastal City
文章编号:
1001-8662（2023）02-0174-11
作者:
胡增辉
宁波轨道交通集团有限公司，浙江 宁波 315000
Author(s):
HU Zenghui
Ningbo Rail Transit Group Co.， Ltd.， Ningbo 315000， China
关键词:
软土基坑; 变形因素; 统计分析; 综合动态预警
Keywords:
Soft soil excavation; Deformation factors; Statistical analysis; Comprehensive dynamic early warning
分类号:
U455.4
DOI:
10.13512/j.hndz.2023.02.20
文献标志码:
A
摘要:
依托某滨海城市轨道交通一、二期建设工程全部113个车站基坑，以测斜及地表沉降两个关键指标表征基坑变形特征，统计分析实际监测成果，对基坑变形及影响因素进行了研究。结果表明：地层条件是影响基坑变形的最关键因素，当基底和墙趾均处于不稳定土层时基坑变形最大，当基底处于不稳定土层、墙趾处于稳定土层时变形次之；设计因素对于基坑变形具有重要影响，大厚度、加强配筋地墙对基坑的变形控制明显优于小厚度、未加强配筋地墙，抽条加固对基坑变形的控制效果较抽条+裙边、网格加固等形式差；在相关规范基础上，通过工程实践形成了该滨海城市轨道交通工程基坑变形综合动态预警方法，避免了仅依赖单一指标导致的频繁预警及可靠性等问题，有效减少了预警次数、避免了不必要的资源浪费，但需要正确判断基坑风险状态，对相关人员的工程经验要求较高。
Abstract:
Based on all 113 station foundation pits of the first and second phase construction projects of a coastal urban rail transit， the deformation characteristics of foundation pits were characterized by two key indicators of inclination measurement and surface settlement. The actual monitoring results were statistically analysed，and the deformation and influencing factors of foundation pits was analysed. The results show that the stratum condition is the most critical factor affecting the deformation of foundation pit. The deformation is the largest when both the base and the wall toe are in the unstable soil layer，and the deformation is the second when the base is in the unstable soil layer and the wall toe is in the stable soil layer. Design factors have an important influence on the foundation pit deformation. The deformation control of the foundation pit by the large-thickness， reinforced diaphragm wall is significantly better than that of the small-thickness， unreinforced diaphragm wall. The control effect of strip reinforcement on the foundation pit deformation is worse than that of strip + skirt， grid reinforcement and other forms. On the basis of relevant specifications， a comprehensive dynamic early warning method for foundation pit deformation of the coastal urban rail transit project is formed through engineering practice， which avoids the problems of frequent early warnings and reliability problems caused by relying only on a single indicator， effectively reduces the number of warnings and avoids unnecessary waste of resources. However，it is necessary to correctly judge the risk status of the foundation pit， which requires high engineering experience of relevant personnel

参考文献/References:

[1]中华人民共和国中央人民政府网站.中华人民共和国国民经济和社会发展第十四个五年规划和2035年远景目标纲要[R/OL].（2021-03-13）[2022-08-10]. http：//www.gov. cn/xinwen/2021-03/13/content_5592681.htm.[2]中国交通新闻网.城市轨道交通运营里程达8708公里[EB/OL].（2022-01-07）[2022-08-10]. https：//www.zgjtb. com/2022-01/07/content_303088.html[3]钟俊辉，尹培林，滕超，等.福州软土地区地铁车站基坑墙体变形特性分析[J].地下空间与工程学报，2018，14（S2）：821-827.[4]丁智，王达，王金艳，等.浙江地区软弱土深基坑变形特点及预测分析[J].岩土力学，2015，36（S1）：506-512.[5]王占生，张佳莉，杜江涛.地铁车站基坑变形规律分析——以苏州地区为例[J].土工基础，2021，35（1）：1-5.[6]刘东燕，邓尧，黄伟，等.含深厚海相软土层基坑开挖变形影响因素分析[J].科学技术与工程，2017，17（17）：318-324.[7]秦会来，黄俊，李奇志，等.深厚淤泥地层深基坑变形影响因素分析[J].岩土工程学报，2021，43（S2）：23-26.[8]宋顺龙.宁波轨道交通车站基坑变形特征统计分析[J].都市快轨交通，2017，30（04）：71-75+85.[9]喻军，龚晓南，李元海.基于海量数据的深基坑本体变形特征研究[J].岩土工程学报，2014，36（S2）：319-324.

备注/Memo

备注/Memo:
收稿日期：2022-10-12作者简介：胡增辉（1981-），男，博士，高级工程师，主要研究方向为城市轨道交通工程建设管理、地下工程等。E-mail：819189292@qq.com
更新日期/Last Update: 2023-06-15