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粗粒土中预制桩的静压施工残余应力

俞峰, 谭国焕, 杨峻, 李启光

俞峰, 谭国焕, 杨峻, 李启光. 粗粒土中预制桩的静压施工残余应力[J]. 岩土工程学报, 2011, 33(10): 1526-1536.
引用本文: 俞峰, 谭国焕, 杨峻, 李启光. 粗粒土中预制桩的静压施工残余应力[J]. 岩土工程学报, 2011, 33(10): 1526-1536.
YU Feng, THAM Leslie George, YANG Jun, LEE Peter Kai Kwong. Post-installation residual stresses in preformed piles jacked into granular soils[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(10): 1526-1536.
Citation: YU Feng, THAM Leslie George, YANG Jun, LEE Peter Kai Kwong. Post-installation residual stresses in preformed piles jacked into granular soils[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(10): 1526-1536.

粗粒土中预制桩的静压施工残余应力  English Version

基金项目: 浙江省自然科学基金项目(Y1090610);住建部科学技术项目(2011-K3-34)
详细信息
    作者简介:

    俞 峰 (1976 – ) ,男,浙江富阳人,博士,副教授,主要从事桩基研究与教学工作。

  • 中图分类号: TU473.1

Post-installation residual stresses in preformed piles jacked into granular soils

  • 摘要: 预制桩 沉桩施工阶段形成的桩身残余应力对桩的工作性状有重要影响。原位观测了两根 H 型钢桩静力压入粗粒土地基过程中的桩身应力,测得了很大的桩身与桩端施工残余应力。施工残余摩阻力之中性点深度随贯入桩长增加而下移,但两者之比值趋于定值。桩端残余应力除了与弹性系数有关,还受到压桩力与贯入速率的影响。随着压桩荷载循环次数的增长,残余负摩阻力不断累积,但某一固定土层深度的单位残余负摩阻力却呈现下降趋势,这与沉桩侧摩阻力的疲劳退化机理是一致的。施工残余应力的存在改变了桩周土与桩端土的初始应力状态,使得桩–土体系在工作条件下会沿着与预期不一致的应力路径受荷至破坏。这对传统的静载荷试验和 Osterberg 试桩的成果分析方法提出了挑战。若考虑施工残余应力,对桩的抗拔承载性状有利,并使得开口管桩土塞效应问题变得更复杂。桩身残余应力的分布可基于残余摩阻力的折线型分布假定,利用桩端残余应力来预测。
    Abstract: The working performance of a preformed pile may be significantly affected by the residual pile stress generated in the pile installation process. A field-test program is conducted in this study to investigate the load transfer behavior of two instrumented steel H-piles jacked into granular deposits during installation. Significant post-installation residual stresses are found to be locked in the test piles. The depth of neutral point for the residual shaft friction increases with increasing pile penetration but their ratios tend to be an invariable. Besides the well-known elasticity coefficient, the factors affecting the residual point resistance include the jacking force and the penetration rate. The average residual negative friction accumulates as the number of jacking strokes increases. Nevertheless, the unit residual negative friction at a given horizon shows a trend of degradation, which can be attributed to the presence of friction fatigue during pile installation. The residual pile stress is responsible for the variation in the stress state of the soils surrounding the pile shaft and beneath the pile base prior to loading service. This indicates that the pile-soil system will follow an unanticipated stress path toward axial loading failure. The data interpretation methods routinely adopted in the static and O-cell loading tests are going to be challenged in case that the influence of post-installation residual stress is involved. Also, the post-installation residual stress imposes positive effect on the uplift capacity of pile and increases the complexity of the plugging behavior of open-ended pipe piles. Assuming that the distribution of residual shaft friction resembles a folded line, a semi-empirical framework is proposed to estimate the residual pile stress at any depth from the knowledge of residual point resistance.
  • [1] ZHANG L M, WANG H. Field study of construction effects in jacked and driven steel H-piles[J]. Géotechnique, 2009, 59 (1): 63 – 69.
    [2] VESIC A S. On the significance of residual loads for load response of piles[C]// Proceedings of the 9th International Conference on Soil Mechanics and Foundation Engineering. Tokyo: 374 – 379, 1977.
    [3] O'NEILL M W, HAWKINS R A, AUDIBERT J M E. Installation of pile group in overconsolidated clay[J]. Journal of the Geotechnical Engineering Division, 1982, 108 (GT11): 1369 – 1386.
    [4] RIEKE R D, CROWSER J C. Interpretation of pile load test considering residual stresses[J]. Journal of Geotechnical Engineering, 1987, 113 (4): 320 – 334.
    [5] ALTAEE A, FELLENIUS B H, EVGIN E. Axial load transfer for piles in sand. I. Tests on an instrumented precast pile[J]. Canadian Geotechnical Journal, 1992, 29 (1): 11 – 20.
    [6] ALTAEE A, FELLENIUS B H, EVGIN E. Load transfer for piles in sand and the critical depth[J]. Canadian Geotechnical Journal, 1993, 30 (3): 455 – 463.
    [7] PAIK K, SALGADO R, LEE J, Kim B. Behavior of open- and closed-ended piles driven into sands[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2003, 129 (4): 296 – 306.
    [8] ZHANG L M, WANG H. Development of residual forces in long driven piles in weathered soils[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2007, 133 (10): 1216 – 1228.
    [9] BRIAUD J L, TUCKER L. Piles in sand: a method including residual stresses[J]. Journal of Geotechnical Engineering, 1984, 110 (11): 1666 – 1680.
    [10] POULOS H G. Analysis of residual stress effects in piles[J]. Journal of Geotechnical Engineering, 1987, 113 (3): 216 – 229.
    [11] DARRAG A A, LOVELL C W. A simplified procedure for predicting residual stresses for piles[C]// Proceedings of the 12th International Conference on Soil Mechanics and Foundation Engineering. Rio de Janeiro: 1127 – 1130, 1989.
    [12] COSTA L M, DANZIGER B R, LOPES F R. Prediction of residual driving stresses in piles[J]. Canadian Geotechnical Journal, 2001, 38 (2): 410 – 421.
    [13] ALTAEE A, EVGIN E, FELLENIUS B H. Axial load transfer for piles in sand. II. Numerical analysis[J]. Canadian Geotechnical Journal, 1992, 29 (1): 21 – 30.
    [14] 张文超 . 静压桩残余应力数值模拟及其对桩承载性状影响分析 [D]. 天津 : 天津大学 , 2007. (ZHANG Wen-chao. Numerical simulation of residual stress of jacked pile and its effect on the behavior of pile[D]. Tianjin : Tianjin University , 2007. (in Chinese))
    [15] ALAWNEH A S, HUSEIN MALKAWI A I. Estimation of post driving residual stresses along driven piles in sand[J]. Geotechnical Testing Journal, 2000, 23 (3): 313 – 326.
    [16] ALAWNEH A S, NUSIER O, HUSEIN MALKAWI A I, AL-KATEEB M. Axial compressive capacity of driven piles in sand: a method including post-driving residual stresses[J]. Canadian Geotechnical Journal, 2001, 38 (2): 364 – 377.
    [17] 张明义 . 静力压入桩的研究与应用 [M]. 北京 : 中国建材工业出版社 , 2004. (ZHANG Ming-yi. Research and application on the jacked piles[M]. Beijing: China Building Material Industry Press, 2004. (in Chinese))
    [18] RANDOLPH M F. Science and empiricism in pile foundation design[J]. Géotechnique, 2003, 53 (10): 847 – 875.
    [19] YANG J, THAM L G, LEE P K K, YU F. Observed performance of long steel H-pile jacked into sandy soils[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2006, 132 (1): 24 – 35.
    [20] YANG J, THAM L G, LEE P K K, CHAN S T, YU F. Behaviour of jacked and driven piles in sandy soil[J]. Géotechnique, 2006, 56 (4): 245 – 259.
    [21] 俞 峰 , 谭国焕 , 杨 峻 , 等 . 静压桩残余应力的长期观测性状 [J]. 岩土力学 , 2011, 32 (8): 2318 – 2324. (YU Feng, THAM L G, YANG Jun, et al. Observed long-term behavior of the residual stress in jacked pile[J]. Rock and Soil Mechanics, 2011, 32 (8): 2318 – 2324. (in Chinese))
    [22] SEO H, YILDIRIM I Z, PREZZI M. Assessment of the axial load response of an H pile driven in multilayered soil[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2009, 135 (12): 1789 – 1804.
    [23] LIU J W, ZHANG Z M, YU F, XIE Z Z. Case history of installing instrumented jacked open-ended piles[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2009, in press, Manuscript No. GTENG-1324.
    [24] WHITE D J, LEHANE B M. Friction fatigue on displacement piles in sand[J]. Géotechnique, 2004, 54 (10): 645 – 658.
    [25] FAKHARIAN K, EVGIN E. Cyclic simple-shear behavior of sand-steel interfaces under constant normal stiffness condition[J]. J ournal of Geotech nical and Geoenvir onmental Engineering , 1997, 123 (12): 1096 – 1105.
    [26] 张忠苗 . 桩基工程 [M]. 北京 : 中国建筑工业出版社 , 2007. (ZHANG Zhong-miao. Pile foundation engineering[M]. Beijing: China Construction Industry Press, 2007. (in Chinese))
    [27] KUMRUZZAMAN M, YIN J H. Influences of principal stress direction and intermediate principal stress on the stress-strain-strength behaviour of completely decomposed granite[J]. Canadian Geotechnical Journal, 2010, 47 (2): 164 – 179.
    [28] 龚维明 , 蒋永生 , 翟 晋 . 桩承载力自平衡测试法 [J]. 岩土工程学报 , 2000, 22 (5): 532 – 536. (GONG Wei-ming, JIANG Yong-sheng, ZHAI Jin. Self-balanced loading test for pile bearing capacity[J]. Chinese Journal of Geotechnical Engineering, 2000, 22 (5): 532 – 536. (in Chinese))
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出版历程
  • 发布日期:  2011-10-14

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