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软土中桩端后注浆大直径灌注桩尺寸效应试验研究

张忠苗, 房凯, 房凯

张忠苗, 房凯, 房凯. 软土中桩端后注浆大直径灌注桩尺寸效应试验研究[J]. 岩土工程学报, 2011, 33(sup2): 32-37.
引用本文: 张忠苗, 房凯, 房凯. 软土中桩端后注浆大直径灌注桩尺寸效应试验研究[J]. 岩土工程学报, 2011, 33(sup2): 32-37.
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ZHANG Zhong-miao, HE Jing-yu, FANG Kai. Experimental study on size effect of large-diameter bored cast-in-situ piles with post-grouting in soft soil[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(sup2): 32-37.
Citation: ZHANG Zhong-miao, HE Jing-yu, FANG Kai. Experimental study on size effect of large-diameter bored cast-in-situ piles with post-grouting in soft soil[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(sup2): 32-37.
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软土中桩端后注浆大直径灌注桩尺寸效应试验研究  English Version

  • 1.浙江大学岩土工程研究所,浙江 杭州 310058 ； 2. 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

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,博士,教授,博士生导师,主要从事基础工程和桩基础及其检测方面的教学与研究工作。

  • 中图分类号: TU473

Experimental study on size effect of large-diameter bored cast-in-situ piles with post-grouting in soft soil

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

摘要

    摘要
  • 摘要: 通过杭州某工地 6 根大直径后注浆灌注桩的现场试验研究了软土地区桩端后注浆桩的尺寸效应特性以及后注浆对尺寸效应的影响。结果表明：后注浆对桩侧泥皮的固化、压密等作用减小了尺寸效应对侧阻的影响；而浆液上返高度以外的上部土层,侧阻尺寸效应显著, 900 mm 、 1000 mm 试桩侧阻尺寸效应系数实测值均比计算值要小,随着桩径的增大尺寸效应更为明显,用规范推荐的方法计算注浆桩侧阻尺寸效应系数偏于不安全；另一方面,实测砂、碎石类土层侧阻尺寸效应系数均比黏性土、粉土土层的要小；而端阻尺寸效应能基本消除。
    Abstract: Field loading tests on six large-diameter post-grouting bored cast-in-situ piles are conducted to study the size effect of post-grouting piles and the influence of grouting on them. The results show that the influence of size effect on skin friction decreases due to the solidification and compaction of the shaft side mud after grouting. Whereas the size effect of skin friction can be found obviously for the higher layers unaffected by the grouting. The size effect coefficient of the measured skin friction is smaller than the calculated one for the pile with a diameter of 900 mm and 1000 mm and decreases with the increase of the diameter. It is less conservative to calculate the size effect coefficient with the method used in the current code. It is also found that the size effect coefficient for the sand or gravel layers is smaller than that for clay or silt soil layers. In addition, the size effect of tip resistance of the post-grouting piles can be eliminated.
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    • 参考文献(12)
  • [1] 王俊林 , 马 艳 , 苟利娟 . 大直径超长混凝土灌注桩受力特性试验研究 [J]. 河海大学学报 , 2008, 36 (1): 82 – 87. (WANG Jun-lin, MA Yan, GOU Li-juan, Experimental study of stress characteristics of super-long large diameter bored piles[J]. Journal of Hohai University, 2008, 36 (1): 82 – 87. (in Chinese))
    [2] 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 Architecture and Building Press, 2007. (in Chinese))
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    [4] 管延华 , 宋修广 , 张太平 , 等 . 大直径长桩承载性状的试验研究 [J]. 山东大学学报 , 2003, 33 (6): 694 – 698. (GUAN Yan-hua, SONG Xiu-guang, ZHANG Tai-ping, et al. Experimental research on bearing behavior of large diameter and long bored piles[J]. Journal of Shandong University, 2003, 33 (6): 694 – 698. (in Chinese))
    [5] 张忠苗 , 张广兴 , 吴庆勇 , 等 . 钻孔桩泥皮土与桩间土性状试验研究 [J]. 岩土工程学报 , 2006, 28 (6): 695 – 699. (ZHANG Zhong-miao, ZHANG Guang-xin, WU Qing-yong, et al. Studies on characteristics of mudcake and soil between bored piles[J]. Chinese Journal of Geotechnical Engineering, 2006, 28 (6): 695 – 699. (in Chinese))
    [6] 刘德林 , 刘毓氚 , 刘祖德 . 后压浆提高大直径长桩承载力的应用研究 [J]. 岩石力学与工程学报 , 2001, 20 ( 增刊 1): 1236 – 1239. (LIU De-lin, LIU Yu-chuan, LIU Zu-de. Study on inreasing bearing capacity of large diameter long slurry drilled pile by post-grouting[J]. Chinese Journal of Rock Mechanics and Engineering, 2001, 20 (S1): 1236 – 1239. (in Chinese))
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    [8] 张 帆 , 龚维明 , 戴国亮 . 大直径超长灌注桩荷载传递机理的自平衡试验研究 [J]. 岩土工程学报 , 2006, 28 (4): 464 – 469. (ZHANG Fan, GONG Wei-ming, DAI Guo-liang. Experimental research on the load transfer mechanism of super-long large diameter bored pile with the self-balanced load test method[J]. Chinese Journal of Geotechnical Engineering, 2006, 28 (4): 464 – 469. (in Chinese))
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    [10] 刘福天 , 赵春风 , 吴 杰 , 等 . 常州地区大直径钻孔灌注桩承载性状及尺寸效应试验研究 [J]. 岩石力学与工程学报 , 2010, 29 (4): 858 – 864. (LIU Fu-tian, ZHAO Chun-feng, WU Jie, et al. Experimental research on bearing behavior and size effect of large diameter bored cast -in-situ piles in Changzhou area[J]. Chinese Journal of Rock Mechanics and Engineering, 2010, 29 (4): 858 – 864. (in Chinese))
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出版历程
  • 收稿日期:  2011-08-07
  • 发布日期:  2011-12-06

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