临江基坑变形及受力性状三维数值分析

丁勇春; 程泽坤; 王建华; 李耀良; 袁芬

临江基坑变形及受力性状三维数值分析 English Version

(1. 中交第三航务工程勘察设计院有限公司，上海 200032；2. 上海交通大学土木工程系，上海 200240；3. 上海市基础工程有限公司，上海 200002)

详细信息

作者简介:
丁勇春(1979– )，男，江苏大丰人，博士，高级工程师，主要从事基坑工程及港口岩土工程的设计与研究工作。

中图分类号: TU473.2
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出版历程
- 收稿日期: 2012-11-12
- 发布日期: 2012-11-12

Three-dimensional numerical analysis of deformation and mechanical behavior of deep excavations adjacent to river

(1. CCCC Third Harbor Consultants Co., Ltd., Shanghai 200032, China; 2. Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 3. Shanghai Foundation Engineering Co., Ltd., Shanghai 200002, China)

摘要

摘要: 邻近江河深基坑由于受地下水渗流及潮位变化的影响，相关的设计与计算方法更加复杂。采用FLAC3D对某紧邻黄浦江的狭长形超长深基坑进行三维数值模拟，探讨基坑分区开挖、坑内地基加固、坑外潮位变化等施工条件对基坑变形及受力的影响，并与实测数据进行对比分析。结果表明，计算模型能够较好地预测不同施工条件下基坑的变形性状；平均潮位下基坑支护结构处于对称平衡受力状态，对维持基坑的整体稳定有利；不同分区间的封堵墙对基坑长边围护墙侧向变形的控制效果不明显；潮位对临江侧基坑围护墙侧向变形的影响较大，低潮位时墙顶会向坑外变形，并影响第1道支撑的受力，潮位变化较大的临江深基坑第1道支撑应采用与墙体整体现浇的钢筋混凝土支撑。
- 基坑 /
- FLAC3D /
- 数值模拟 /
- 分区开挖 /
- 地基加固 /
- 潮位
Abstract: A three-dimensional numerical simulation based on FLAC3D is carried out to investigate the deformation and mechanical behavior of a deep excavation project adjacent to Huangpu River in Shanghai soft soil deposits, in which the impacts of zoned excavation, installation of partition wall, inside spaced strip and peripheral ground reclamation, and variation of outside tide level are considered and the comparison with in-situ monitoring data is conducted. The predicted lateral displacement of the retaining wall agrees well with the monitored value, consequently, the reliability of the numerical model is verified. The study shows that it is advantageous to the global stability of the retaining and propping structures with symmetric loading condition under the mean tidal level. The effect of the partition wall on deformation control of the retaining wall is not distinct; nevertheless, the influence of variation of tidal level on the lateral displacement of the top of the retaining wall is conspicuous, resulting in change of compression and tension state of the first level strut. Therefore, cast-in-place reinforced concrete beam is recommended for the first level strut to ensure effective connection between the strut and the retaining wall.
- excavation /
- FLAC3D /
- numerical simulation /
- zoned excavation /
- ground reclamation /
- tidal level

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参考文献(7)

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