开挖状态下既有托换桩基变形有限元分析

李德超; 钱建固; 吴世明; 刘冠水

开挖状态下既有托换桩基变形有限元分析 English Version

(1. 同济大学岩土与地下工程教育部重点实验室，上海 200092；2. 同济大学地下建筑与工程系，上海 200092；3. 浙江浙大网新集团有限公司，浙江杭州 310007)

详细信息

作者简介:
李德超(1987– )，男，河北廊坊人，硕士研究生，研究方向为基坑工程及桩基工程。

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

Numerical analysis of deformation behaviors of underpinning piles during excavation

(1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 3. Insigma group Co.,Ltd., Hangzhou 310007, China)

摘要

摘要: 采用有限元数值方法分析开挖施工对开挖区域内托换桩影响特性。对上部结构与地基进行整体建模，侧重分析桩的回弹变形，以评估其对上部结构的不利影响，进而依据桩顶回弹变形与承载特性确定千斤顶的变形调整方案。分析表明，为控制开挖过程中顶板“零”变形状态，需维持桩顶某常值加荷状态。在此托换调节过程中，随着开挖深度的增加，桩基浅埋部位轴力增大，但深部桩身轴力减小。当开挖较深（超过5 m）时，桩身底部出现负摩阻力从而该桩身区域出现局部受拉。
- 托换桩 /
- 基坑开挖 /
- 有限元法 /
- 回弹
Abstract: The finite element method is used to analyze the effects of excavation on the behaviors of underpinning piles in excavation area. First, numerical model is adopted to simulates the interaction of structure-foundation-soil and estimate negative effects of the rebound deformation of underpinning piles on the top plate. Based on the deformation and bearing state of the underpinning piles, the adjusting deformation from oil jack is available. It is demonstrated that a constant level of load should be applied to the top of the underpinning piles so that the top plate has the “zero” additional deformation. During the process of loading adjustment, the axial force at the upper part of the underpinning pile increases and the axial force at the lower part decreases as the depth of excavation increases gradually. When the depth of excavation is over 5 meters, negative skin friction occurs at the lower part of pile and results at the axial tension in the bottom. |
- underpinning pile /
- pit excavation /
- finite element method /
- rebound deformation

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参考文献(9)

[1]	THORBURN S, HUTCHISON J. Underpinning[M]. Glasgow: Surrey University Press, 1985.
[2]	TURNER J P, STEELE J A, MAHER W F et al. Design, construction, and performance of an anchored tangent pile wall for excavation support[J]. Geotechnical Special Publication, ASCE, 2004,124 322-333.
[3]	POULOS H G. Design of underpinning piles to reduce settlements[J]. Geotechnical Special Publication, ASCE, 1994, 40(2): 1000–1010.
[4]	DIN-4123．Excavations foundations and underpinnings in the area of existing buildings[S]. Germany, Ersatz, 2000.
[5]	CECS 295:2011 建（构）筑物托换技术规程[S]. 2011. (CECS 295:2011 Technical specification for underpinning for buildings and structuring[S]. 2011.(in Chinese))
[6]	熊小刚, 江见鲸. 桩基托换对上部结构影响的非线性有限元分析[J]. 特种结构, 2003, 20(1): 8–10. (XIONG Xiao-gang, JIANG Jian-jing. The nonlinear finite element analysis of the affect of superstructure with pile underpinning[J]. Special Structures, 2003, 20(1): 8–10. (in Chinese))
[7]	贾强一, 张鑫, 应惠清. 桩基础托换开发地下空间不均匀沉降的数值分析[J]. 岩土力学, 2009, 30(11): 3500–2504. (JIA Qiang-yi, ZHANG Xin, YING Hui-qing. Numerical analysis of settlement difference for pile foundation underpinning for constructing underground space[J]. Rock and Soil Mechanics, 2009, 30(11): 3500–2504. (in Chinese))
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开挖状态下既有托换桩基变形有限元分析 English Version

作者简介: 李德超(1987– )，男，河北廊坊人，硕士研究生，研究方向为基坑工程及桩基工程。

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出版历程

Numerical analysis of deformation behaviors of underpinning piles during excavation

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出版历程

目录

作者简介:
李德超(1987– )，男，河北廊坊人，硕士研究生，研究方向为基坑工程及桩基工程。