开口环形深基坑围护结构变形监测与数值分析
摘要:南京扬子储煤筒仓基坑工程地基中分布有厚度较大的软土层，且该工程基坑为11.40 m深，直径约27.0 m的开口圆环形，其中开口段弧长约10.0 m。基坑围护结构采用钻孔灌注桩结合环形内支撑的型式。开口段对基坑的变形和稳定性有较大的影响。以该工程为例，采用三维有限元数值分析方法，建立了摩尔-库仑弹塑性模型，进行不同开挖阶段的数值模拟计算，并与监测结果进行了对比。结果表明，计算值与实测值差距较小，变化趋势基本一致，有限元计算的结果是可信的，可为类似工程优化设计与施工提供参考。
Abstract:There are thicker soft soil layers distributed in the subsoil of Nanjing Yangzi coal storage silo project which deep foundation engineering excavates a pit with the depth of 11.40 m. The row piles were used as retaining structure with cast-in-situ bored pile and ring beams as struts which are 10. 0 m length of open arc. However, the open sections of ring struts have a great influence on the deformation and stability of foundation pit excavation. Based on this practical engineering, a three-dimensional finite element numerical analysis model was established and the soil and the interface elements were modeled as elasto-plastic materials obeying Mohr-Coulomb failure criterion, then staged excavations were simulated and calculated. Compared with monitoring data, the results showed that the difference between calculated values and measured values was negligible, and the variation trend was almost the same. The calculated results of finite element are reliable, which can be references for design and construction improvement of similar engineering.
中文标题：
开口环形深基坑围护结构变形监测与数值分析
Deformation Monitoring and Numerical Analysis of Supporting Structure of Open Ring Deep Foundation Pit
作者：
章新1,赵升峰1,黄广龙2
Zhang Xin1,Zhao Shengfeng1,Huang Guanglong2
作者简介:章新,1988年生,男,汉族,江苏徐州人,助理工程师,从事岩土工程设计与咨询工作。E-mail:15951610987@163.com
通讯地址：
1. 南京市测绘勘察研究院有限公司, 江苏南京 210019; 2. 南京工业大学交通学院, 江苏南京 210009
1.NanjingInstituteofSurveying,Mapping&GeotechnicalInvestigation,Co.,Ltd,Nanjing210019,Jiangsu,China; 2.CollegeofTransportationScience&EngineeringNanjingUniversityofTechnology,Nanjing210009,Jiangsu,China
中图分类号:TV551.4;TU942
doi:10.3969/j.issn.1007-2993.2014.03.008
出版物：岩土工程技术
收稿日期:2013-10-30
网络出版日期:2021-07-19
关键词:开口环形深基坑,三维有限元,水平位移,现场监测
Key words:open ring deep foundation pit,3D finite element,horizontal displacement,field monitoring
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