某邻地铁超大直径圆环撑软土深基坑变形特性分析
摘要:以深圳都市茗荟花园（二期）基坑为工程背景，对超大直径圆环撑软土深基坑支护桩侧向变形、地面沉降、支撑轴力等监测数据进行了分析，分析了基坑变形的时空分布特征，探讨了基坑变形与开挖深度、软土厚度的关系，得出下列结论：（1）支护结构的最大变形随着基坑开挖深度的增加而逐步增大，基坑开挖至坑底后，整体变形最大位置位于基坑两侧长边中部采用圆环支撑部位。（2）咬合桩+刚度较大的超大直径环形钢筋砼撑结构应用于软土深基坑中在变形控制及减小基坑工程对周边变形影响等方面均非常有效。（3）随着基坑向下不断开挖，三种方式所反映出的支护结构的最大水平位移量均逐渐增加，但变化幅度有一定的差异。
Abstract:Taking the foundation pit of Minghui Garden (phase II) in Shenzhen reclamation area as the engineering background, the monitoring data of lateral deformation, slope top displacement and support axial force caused by foundation pit construction were analyzed. The temporal and spatial distribution characteristics of deep foundation pit deformation in soft soil were discussed, and the relationship between foundation pit deformation and excavation depth as well as soft soil thickness was discussed. The conclusions were as followed: (1) The maximum deformation of the supporting structure gradually increases with the increase of the excavation depth of the foundation pit. After the foundation pit was excavated to the bottom of the pit, the maximum overall deformation was located at the middle of the long side on both sides of the foundation pit, which was supported by a ring. (2) The application of bite pile + super large diameter ring reinforced concrete support structure with large stiffness in soft soil deep foundation pit was very effective in deformation control and reducing the influence of foundation pit engineering on surrounding deformation. (3) With the continuous excavation of the foundation pit downward, the maximum horizontal displacement of the support structure reflected by the three methods gradually increases, but the variation range was different.
中文标题：
某邻地铁超大直径圆环撑软土深基坑变形特性分析
Analysis on Deformation Characteristics of Super Large Diameter Ring Bracing Deep Foundation Pit in Soft Soil near Subway
作者：
乔丽平1, 2,,李韵迪1, 2,杨超3
Qiao Liping1, 2,,Li Yundi1, 2,Yang Chao3
作者简介:乔丽平，男，1979年生，湖北孝感人，硕士，正高级工程师，注册土木工程师（岩土），主要从事地基处理、基坑、边坡工程的设计、研究及咨询工作。E-mail：673618905@qq.com
通讯地址：
1.深圳市龙岗地质勘查局，广东深圳 518172 2.深圳市岩土综合勘察设计有限公司，广东深圳 518172 3.五邑大学土木建筑学院，广东江门 529020
1.ShenzhenLonggangGeologicalExplorationBureau,Shenzhen518172,Guangdong,China 2.ShenzhenComprehensiveGeotechnicalEngineeringInvestigation&DesignCo.,Ltd.,Shenzhen518172,Guangdong,China 3.SchoolofCivilEngineeringandArchitecture,WuyiUniversity,Jiangmen529020,Guangdong,China
中图分类号:TU 473
doi:10.3969/j.issn.1007-2993.2023.01.021
出版物：岩土工程技术
收稿日期:2021-11-04
网络出版日期:2023-04-18
刊出日期:2023-02-08
关键词:超大直径,圆环撑,软土深基坑,变形特性
Key words:super large diameter,ring brace,deep foundation pit in soft soil,deformation characteristics
文档包含图片数量：图片(11)张
文档包含表格数量：表格(6)个
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基金项目：
基金项目:国家自然科学基金青年科学基金项目（41702323）；广东省普通高校特色创新项目（自然科学类）（2020KTSCX152）
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