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    破坏和非破坏后注浆抗压桩受力性状现场试验研究

    张忠苗, 张乾青

    张忠苗, 张乾青. 破坏和非破坏后注浆抗压桩受力性状现场试验研究[J]. 岩土工程学报, 2011, 33(10): 1601-1608.
    引用本文: 张忠苗, 张乾青. 破坏和非破坏后注浆抗压桩受力性状现场试验研究[J]. 岩土工程学报, 2011, 33(10): 1601-1608.
    shu
    ZHANG Zhong-miao, ZHANG Qian-qing. Field tests on behavior of destructive and non-destructive base-grouting piles under compression[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(10): 1601-1608.
    Citation: ZHANG Zhong-miao, ZHANG Qian-qing. Field tests on behavior of destructive and non-destructive base-grouting piles under compression[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(10): 1601-1608.
    shu

    破坏和非破坏后注浆抗压桩受力性状现场试验研究  English Version

    • 1. 浙江大学软弱土与环境土工教育部重点实验室，浙江 杭州 310058 ； 2. 浙江大学岩土工程研究所，浙江 杭州 310058

    基金项目: 国家自然科学基金项目(51078330)
    详细信息
      作者简介:

      张忠苗 (1961 – ) ，男，浙江宁海人，博士生导师，教授，主要从事基础工程与地基处理的研究、教学工作。

    • 中图分类号: TU473.1

    Field tests on behavior of destructive and non-destructive base-grouting piles under compression

    • 1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China; 2. Institute of Geotechnical Engineering, Zhejiang University , Hangzhou 310058, China

    摘要

      摘要
    • 摘要: 通过桩身埋设有钢筋应力计的 2 根直径不同的破坏性和非破坏性后注浆抗压试桩现场静载试验，对比分析了破坏性和非破坏性后注浆抗压试桩的受力性状。现场试验表明，极限荷载下非破坏性和破坏性后注浆桩的桩端力荷载分担比约为 40% 且同一桩顶荷载水平下，桩端荷载分担比随桩径的增大而减小。最大试验荷载下非破坏性试桩浅层土侧阻力完全发挥并有侧阻软化趋势，而破坏性试桩全桩长范围桩侧阻力均表现为软化性状。实测发现不同土中桩侧摩阻力充分发挥时对应的桩顶沉降约为（ 1% ～ 4% ） D （ D 为桩径）。非破坏性试桩实测得到的桩端位移–桩端力曲线表现为硬化特性，而试桩破坏性试验中实测得到的桩端位移–桩端力曲线表现为软化特性。
      Abstract: Field tests on the behaviors of one destructive base-grouting pile and one non-destructive base-grouting pile under compression are presented. The two piles have different diameters and are instrumented with rebar strain gauges along the pile shafts. The results of these full-scale loading tests show that the ratio of the tip load to the pile head load of the destructive and the non-destructive base-grouting piles is about 40% at the capacity load level, and it decreases with the increase of pile diameter at the same load level. Furthermore, at shallow depth the skin friction of the non-destructive pile decreases from the ultimate skin resistance with the increase of load as the test pile is loaded to the maximum value, whereas for the destructive pile the shaft resistance along the pile depth approaches to the limiting state and decreases from a peak value with further increase of the pile head load. The thresholds of settlement at the pile head for fully mobilizing the skin resistances in different soils are about 1% to 4% of the pile diameter. The load transmission curve of the soils around the pile base corresponds to a softening model in the field tests on the destructive pile, whereas the settlement-resistance curve of the non-destructive pile developed at the pile tip follows a hardening model.
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      • 参考文献(11)
    • [1] 张忠苗 , 张乾青 . 后注浆抗压桩受力性状的试验研究 [J] . 岩石力学与工程学报 , 2009, 28 (3): 475 – 482. (ZHANG Zhong-miao, ZHANG Qian-qing . Experimental study on mechanical properties of compression pile with post-grouting [J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28 (3): 475 – 482. (in Chinese))
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      [4] 何 剑 . 泥岩地基中灌注桩竖向承载性状试验研究 [J]. 岩石力学与工程学报， 2002, 21 (10): 1573 – 1577. (HE Jian . Testing study on vertical bearing properties of cast-in-place pile in muddy rock foundation [J]. Chinese Journal of Rock Mechanics and Engineering, 2002, 21 (10): 1573 – 1577. (in Chinese))
      [5] 中国建筑科学研究院 . JGJ106 — 2003 建筑桩基检测技术规范 [S]. 北京 : 中国建筑工业出版社 , 2003 . (China Academy of Building Research . JGJ106 — 2003 Technical code for testing of building foundation piles[S]. Beijing: China Construction Industry Press, 2003. (in Chinese))
      [6] 中国建筑科学研究院 . JGJ 94 — 2008 建筑桩基技术规范 [S]. 北京 : 中国建筑工业出版社 , 2008. ( China Academy of Building Research . JGJ 94 — 2008 Technical code for building pile foundations[S]. Beijing: China Construction Industry Press, 2008. (in Chinese) )
      [7] 辛公锋 . 大直径超长桩侧阻软化试验与理论研究 [D]. 杭州 : 浙江大学 , 2006 . (XIN Gong-feng. Test and theory study on shaft resistance softening of large diameter and supper-long piles [D] . Hangzhou: Zhejiang University, 2006. (in Chinese))
      [8] POULOS H G. Influence of shaft length on pile load capacity in clays[J]. Géotechnique, 1982, 32 (2): 145 – 48.
      [9] RANDOLPH M F, WROTH C P. Analysis of deformation of vertically loaded piles[J]. Journal of the Geotechnical Engineering Division, 1978, 104 (12): 1465 – 488.
      [10] ARMALEH S, DESAI C S. Load deformation response of axially loaded piles[J]. Journal of the Geotechnical Engineering Division, 1987, 113 (12): 1483 – 499.
      [11] CHOW Y K. Analysis of vertically loaded pile groups[J]. International Journal of Numerical and Analytical Methods in Geomechanics, 1986, 10 (1): 59 – 72.
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    • 发布日期:  2011-10-14

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