软土地区深基坑开挖坑底隆起的有限元分析

曹力桥

软土地区深基坑开挖坑底隆起的有限元分析 English Version

曹力桥

中铁第四勘察设计院集团有限公司,湖北武汉 430063

详细信息

作者简介:
曹力桥(1982- )，男，硕士，工程师，主要从事轨道交通与地下空间结构、隧道、地基处理及基坑工程等方面设计与研究。E-mail: caoliqiao52025@163.com.cn。

中图分类号: TU473.2
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- 文章访问数: 353
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出版历程
- 收稿日期: 2013-04-29
- 发布日期: 2013-11-24

Finite element method analysis of bottom upheaval of deep foundation pits in soft-clay ground due to excavation

CAO Li-qiao

China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, China

摘要

摘要: 软土地区深基坑施工,会涉及到降低地下水的问题。传统深基坑设计常用弹性抗力法在计算基坑回弹变形,并未考虑降水的影响。本文在考虑渗流固结耦合的基础上,应用有限元软件ABAQUS建立存在工程桩和不存在工程桩的开挖与降水开挖三维基坑模型。通过对比分析,总结出基坑开挖降水过程中基坑坑底隆起的基本规律,分析深基坑坑底隆起变形及其影响因素,得出工程降水对深基坑土体的压密作用、基坑出现塑性隆起现象以及降水对基坑稳定有利的结论,并得出软土深基坑开挖过程中工程桩对坑底隆起变形有明显的抑制作用的结论。
- 坑底隆起变形 /
- 降水开挖 /
- 渗流固结耦合 /
- 压密 /
- 抑制作用
Abstract: The construction of deep foundation pits in soft-clay ground relates to dewatering problem. In the traditional design, the elastic resistance method is commonly used to calculate their rebound deformation without considering the effect of dewatering. A three-dimensional finite element model is established to simulate the excavation processes of deep foundation pits with or without considering engineering piles on the basis of seepage consolidation coupling by means of ABAQUS. Through comparison and analysis, the basic upheaval rules of pit bottom are summarized. The influencing factors for the bottom upheaval of deep foundation pits are analyzed. The conclusions are drawn as follows: the soils are compacted during dewatering; the foundation pit exhibits plastic upheaval; the dewatering is in favor of the stability of the foundation pits; the engineering piles in the foundation pit in soft-clay ground play an obvious role in inhibiting its bottom upheaval.
- upheaval deformation of pit bottom /
- excavation and dewatering /
- seepage consolidation coupling /
- compaction /
- inhibition effect

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参考文献(9)

[1]	王卫东, 王建华. 深基坑支护结构与主体结构相结合的设计、分析与实例[M]. 北京: 中国建筑工业出版社, 2007. (WANG Wei-dong, WANG Jian-hua. Design, analysis and case histories of deep excavations supported by permanent structures[M]. Beijing: China Architecture & Building Press, 2007. (in Chinese))
[2]	李玉岐, 魏婕, 谢康和. 负孔压消散对坑底的回弹影响研究[J]. 长江科学院院报, 2005, 22(4): 52-55. (LI Yu-qi, WEI Jie, XIE Kang-he. Study on influence of dissipation of negative pore water pressure on heave of pit base[J]. Journal of Yangtze River Scientific Research Institute, 2005, 22(4): 52-55. (in Chinese))
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[4]	胡其志, 何世秀, 杨雪强. 基坑开挖基底隆起的估算[J]. 土工基础, 2001, 15(2): 29-30. (HU Qi-zhi, HE Shi-xiu, YANG Xue-qiang. Estimation of the upheaval of foundation pit bottom during excavation[J]. Soil Engineering and Foundation, 2001, 15(2): 29-30. (in Chinese))
[5]	GOH A T C. Estimating basal-heave stability for braced excavations in soft clay[J]. Journal of Geotechnical Engineering, 1994, 120(8): 1430-1436.
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[7]	GOH A T C, KULHAWY F H, WONG K S. Reliability assessment of basal-heave stability for braced excavations in clay[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2008, 134(2): 145-153.
[8]	姜洪伟, 赵锡宏, 张保良. 各向异性条件下软土深基坑抗隆起稳定分析[J]. 岩土工程学报, 1997, 19(1): 1-7. (JIANG Hong-wei, ZHAO Xi-hong, ZHANG Bao-liang. Analysis of heave-resistant stability for deep braced excavation in soft clay under anisotropic condition[J]. Chinese Journal of Geotechnical Engineering, 1997, 19(1): 1-7. (in Chinese))
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文章访问数: 353
HTML全文浏览量: 10
PDF下载量: 614
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软土地区深基坑开挖坑底隆起的有限元分析 English Version

作者简介: 曹力桥(1982- )，男，硕士，工程师，主要从事轨道交通与地下空间结构、隧道、地基处理及基坑工程等方面设计与研究。E-mail: caoliqiao52025@163.com.cn。

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出版历程

Finite element method analysis of bottom upheaval of deep foundation pits in soft-clay ground due to excavation

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出版历程

目录

作者简介:
曹力桥(1982- )，男，硕士，工程师，主要从事轨道交通与地下空间结构、隧道、地基处理及基坑工程等方面设计与研究。E-mail: caoliqiao52025@163.com.cn。