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基坑开挖对抗拔桩承载特性影响的数值分析

林敏博, 刘润, 徐余, 李然

林敏博, 刘润, 徐余, 李然. 基坑开挖对抗拔桩承载特性影响的数值分析[J]. 岩土工程学报, 2013, 35(zk2): 735-739.
引用本文: 林敏博, 刘润, 徐余, 李然. 基坑开挖对抗拔桩承载特性影响的数值分析[J]. 岩土工程学报, 2013, 35(zk2): 735-739.
shu
LIN Min-bo, LIU Run, XU Yu, LI Ran. Numerical analysis of bearing behaviors of uplift piles during pit excavation[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(zk2): 735-739.
Citation: LIN Min-bo, LIU Run, XU Yu, LI Ran. Numerical analysis of bearing behaviors of uplift piles during pit excavation[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(zk2): 735-739.
shu

基坑开挖对抗拔桩承载特性影响的数值分析  English Version

  • 1. 天津大学水利工程仿真与安全国家重点实验室,天津 300072; 2. 天津市建筑设计院,天津 300074

基金项目: 国家自然科学基金创新研究群体科学基金项目（51021004）
详细信息
    作者简介:

    林敏博(1989- )，男，山西临汾人，硕士，主要从事桩基工程与岩土数值分析方面的研究。E-mail: linminbo241@163.com。

  • 中图分类号: TU470

Numerical analysis of bearing behaviors of uplift piles during pit excavation

  • 1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China; 2. Tianjin Architecture Design Institute, Tianjin 300074, China

摘要

    摘要
  • 摘要: 基坑开挖导致地基土体整体处于卸荷状态,从而改变了抗拔桩原有的受力特点。采用数值分析方法,系统研究了基坑开挖导致的原地基中抗拔桩承载特性改变,从基坑开挖的范围、桩的相对位置等方面探讨了对桩的极限抗拔承载力、桩侧摩阻力、桩身轴力的影响规律。结果表明,开挖导致坑底以下土体卸荷回弹,在桩身上部产生正摩阻力,下部产生负摩阻力,桩身产生轴向拉力,极限抗拔力降低,减低程度与基坑开挖的规模成比例；基坑开挖所导致的群桩桩侧摩阻力与桩身轴力变化程度依次为：中心桩>边桩>角桩；群桩的遮帘作用在很大程度上影响中心桩极限抗拔承载力。
    Abstract: The excavation results in unloading state of the soils, which influences the original loading characteristics of uplift piles. Based on the numerical simulation method, change of the bearing behaviors of the uplift piles caused by excavation is systematically studied. The rules of ultimate uplift capacity, side friction and axial force are discussed by comparing different excavation scopes and relative locations. The results show that, excavation leads to soil rebound under the bottom, induces positive side friction in the upper part of the piles and negative side friction in the under part, and reduces the ultimate uplift capacity of the piles. Moreover, the degree of decrease is proportional to the size of the foundation excavation. The variation of side friction and axial force of the center pile caused by foundation pit excavation is more obvious than that of side pile and corner pile and change of corner pile is the minimum. The ultimate uplift capacity of the center pile is largely affected by the curtain effect of group piles.
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    • 参考文献(7)
  • [1] 陈锦剑, 王建华, 范 巍,等. 抗拔桩在大面积深开挖过程中的受力特性分析[J]. 岩土工程学报, 2009, 31(3): 402-407. (CHEN Jin-jian, WANG Jian-hua, FAN Wei, et al. Behavior of up-lift pile foundation during large-scale deep excavation[J]. Chinese Journal of Geotechnical Engineering, 2009, 31(3): 402-407. (in Chinese))
    [2] 朱火根, 孙加平. 上海地区深基坑开挖坑底土体回弹对工程桩的影响[J]. 岩土工程界, 2005, 8(3): 43-46. (ZHU Huo-gen, SUN Jia-ping. The impact of bottom plies due to unloading of deep foundation pit excavation in Shanghai[J]. Geotechnical Engineering World, 2005, 8(3): 43-46. (in Chinese))
    [3] 黄茂松, 郦建俊, 王卫东, 等. 开挖条件下抗拔桩的承载力损失比分析[J]. 岩土工程学报, 2008, 30(9): 1291-1297. (HUANG Mao-song, LI Jian-jun, WANG Wei-dong, et al. Bearing capacity loss ratio of uplift pile under deep excavation[J]. Chinese Journal of Geotechnical Engineering, 2008, 30(9): 1291-1297. (in Chinese))
    [4] 罗耀武, 胡 琦, 陈云敏, 等. 基坑开挖对抗拔桩极限承载力影响的模型试验研究[J]. 岩土工程学报, 2011, 33(3): 427-432. (LUO Yao-wu, HU Qi, CHEN Yun-min, et al. Model tests on ultimate uplift capacity of piles under excavation[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(3): 427-432. (in Chinese))
    [5] 郑 刚, 张立明, 刁 钰. 开挖条件下坑底工程桩工作性状及沉降计算分析[J]. 岩土工程学报, 2011, 32(10): 3089-3096. (ZHENG Gang, ZHANG Li-ming, DIAO Yu. Analysis of working performance of piles beneath excavation bottom and settlement calculation[J]. Chinese Journal of Geotechnical Engineering, 2011, 32(10): 3089-3096. (in Chinese))
    [6] 徐 余, 刘 润. 应用断裂强度理论模拟基坑开挖过程及实测数据分析[J]. 岩石力学与工程学报, 2004, 23(15): 2573-2578. (XU Yu, Liu Run. Simulation on foundation pit excavation with fracture strength theory and interpretation of observed data[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(15): 2573-2578.(in Chinese))
    [7] 王成华, 刘庆晨. 考虑基坑开挖影响的群桩基础竖向承载性状数值分析[J]. 岩土力学, 2012, 33(6): 1851-1856. (WANG Cheng-hua, LIU Qing-chen. Numerical analysis of vertical bearing behavior of group pile foundation considering pit excavation effect[J]. Rock and Soil Mechanics, 2012, 33(6): 1851-1856. (in Chinese))
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出版历程
  • 收稿日期:  2013-07-16
  • 发布日期:  2013-11-24

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