长桩桩侧摩阻力分布与地基附加应力问题及对群桩沉降计算的影响

郑 刚; 张立明; 王 琦

长桩桩侧摩阻力分布与地基附加应力问题及对群桩沉降计算的影响 English Version

郑刚^1,2,,
张立明^1,2,
王琦^1,2

(1. 天津大学土木工程系，天津 300072 ； 2. 滨海土木工程结构与安全教育部重点实验室，天津 300072)

基金项目: 国家自然科学基金项目（ 50878144 ）；国家重点基础研究发展计划（973计划）项目(2010CB732106）

详细信息

作者简介:
郑刚 (1967 – ) ，男，教授，博士生导师，从事土力学及岩土工程的教学与研究。

中图分类号: TU473.1
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- 发布日期: 2011-11-14

Distribution of shaft resistance of long piles and additional stress of foundation and their influences on settlement calculation of group piles

(1. Department of Civil Engineering, Tianjin University, Tianjin 300072, China; 2. MOE Key Laboratory of Coast Civil Structures and Safety, Tianjin 300072, China)

摘要

摘要: 实测资料表明，工作荷载下传统 Geddes 解假设桩侧阻分布与长桩及超长桩实测侧阻分布差别较大，在工作荷载作用下长桩及超长桩桩身上部侧阻首先发挥。在对超长桩实测桩身侧阻分布的归纳总结基础上，建议了桩侧阻两段和三段线性分布模式，并通过对 Geddes 应力解的叠加，推导了两段和三段线性分布组合的侧阻分布模式下的地基附加应力解。建议侧阻分布模式与 Geddes 侧阻分布模式的对比分析表明， Geddes 侧阻分布模式得到的桩端以下桩间土的竖向附加应力明显大于建议模式的结果，导致 Geddes 侧阻分布模式得到的群桩沉降比大于建议的侧阻分布模式计算的沉降比， Geddes 侧阻分布模式夸大了群桩内部各桩的相互作用。实例计算表明，其它条件相同时，建议的侧阻分布模式计算得到的沉降与实测值更接近一些。
- Geddes 应力解 /
- 桩侧摩阻力 /
- 分布模式 /
- 地基附加应力 /
- 沉降计算
Abstract: The measured data show that the distribution of shaft resistance of long and super long piles under vertical working load is quite different from the suggested one by Geddes' solution. The shaft resistance is first fully mobilized at the upper part of the long and super long piles under the working load. Based on the measured shaft resistance distribution of the long and super long piles, both the simplified bilinear and the trilinear patterns of the shaft resistance are suggested. The additional stress solutions of the bilinear and the trilinear distribution patterns are deduced by using the combination of Geddes' solution. The comparison between the solution of the proposed patterns and the Geddes' solution shows that the additional stress beneath the piles of the Geddes' solution is significantly greater than that of the proposed method. So the settlement ratio of Geddes' solution is greater than that of the proposed method and thus the Geddes' solution overestimates the interaction of group piles. Through the back analysis of case studies, it is found that the settlement predicted by the proposed method is closer to the measured one compared with that predicted by the Geddes' solution.
- Geddes' stress solution /
- shaft resistance /
- distribution pattern /
- additional stress of foundation /
- settlement calculation

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参考文献(9)

[1]	MINDLIN R D. Force at a point in the interior of a semi-infinite solid[J]. Physics, 1936, 7 (5): 195 – 202.
[2]	GEDDES J D. Stress in foundation soils due to vertical subsurface load[J]. Géotechnique, 1966, 16 : 231 – 255.
[3]	GB 50007 — 2002 建筑地基基础设计规范 [S]. 北京 : 中国建筑工业出版社 , 2002. (GB50007 — 2002 Code for design of building foundation[S]. Beijing: China Architecture & Building Press, 2002. (in Chinese))
[4]	王志玲 , 靳中华 , 李民生 . 钻孔灌注桩的垂直承载性状试验研究 [C]// 中国土木工程学会土力学及基础工程学会桩基础学术委员会中国工程建设标准化协会地基基础委员会桩与深基础学组第三届联合年会论文集 ( 桩基工程技术 ). 1996: 12 – 17. (WANG Zhi-ling, JIN Zhong-hua, LI Min-sheng. Experimental investigation of vertical bearing behaviour of bored cast-in-situ piles[C]// Proceedings of the Third National Seminar on Pile Foundations (Design, Construction and Inspection Techniques of Pile Foundations). 1996: 12 – 17. (in Chinese))
[5]	辛公锋 , 张忠苗 , 夏唐代 , 等 . 高荷载水平下超长桩承载形状试验研究 [J]. 岩石力学与工程学报 , 2005, 24 (13): 2397 – 2402. (XIN Gong-feng, ZHANG Zhong-miao, XIA Tang-dai, et al. Experimental study on the bearing behaviors of overlength piles under heavy load[J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24 (13): 2397 – 2402. (in Chinese))
[6]	周代表 , 陈守祥 , 宋健伟 . 超长灌注桩在大型火电厂中的应用 [J]. 武汉大学学报 , 2004, 37 ( 增刊 ): 120 – 123. (ZHOU Dai-biao, CHEN Shou-xiang, SONG Jian-wei. Application of overlength bored piles to large-sized thermal power plant[J]. Engineering Journal of Wuhan University, 2004, 37 (S0): 120 – 123. (in Chinese))
[7]	王陶 , 马晔 . 超长钻孔桩竖向承载性状的试验研究 [J]. 岩土力学 , 2005, 26 (7): 1053 – 1057. (WANG Tao, MA Ye. Study on over-length drilled pile bearing behavior under vertical load[J]. Rock and Soil Mechanics, 2005, 26 (7): 1053 – 1057. (in Chinese))
[8]	蔡健 , 周万清 , 林奕喜 , 等 . 深厚软土超长预应力高强混凝土管桩轴向受力性状的试验研究 [J]. 土木工程学报 , 2006, 39 (10): 102 – 106. (CAI Jian, ZHOU Wan-qing, LIN Yi-xi, et al. Experimental study on the axial compressive behavior of super-long PHC pipe piles in deep soft soils[J]. China Civil Engineering Journal, 2006, 39 (10): 102 – 106. (in Chinese))
[9]	龚剑 , 赵锡宏 . 对 101 层上海环球金融中心桩筏基础性状的预测 [J]. 岩土力学 , 2007, 28 (8): 1695 – 1699. (GONG Jian, ZHAO Xi-hong. Prediction of behavior of piled raft foundation for Shanghai World Financial Center of 101-storey[J]. Rock and Soil Mechanics, 2007, 28 (8): 1695 – 1699. (in Chinese))

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长桩桩侧摩阻力分布与地基附加应力问题及对群桩沉降计算的影响 English Version

作者简介: 郑 刚 (1967 – ) ，男，教授，博士生导师，从事土力学及岩土工程的教学与研究。

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出版历程

Distribution of shaft resistance of long piles and additional stress of foundation and their influences on settlement calculation of group piles

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出版历程

目录

作者简介:
郑刚 (1967 – ) ，男，教授，博士生导师，从事土力学及岩土工程的教学与研究。