Model Test on Rooted Uplift Pile in Sand

GE Nan; SUN Yan; HOU Chao-qun; ZHU Da-yong; YIN Yong-gao

doi:10.11988/ckyyb.20180059

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Journal of Changjiang River Scientific Research Institute ›› 2019, Vol. 36 ›› Issue (8) : 146-152. DOI: 10.11988/ckyyb.20180059

ROCK-SOIL ENGINEERING

Model Test on Rooted Uplift Pile in Sand

GE Nan^1,2, SUN Yan^1,2, HOU Chao-qun³, ZHU Da-yong^1,2, YIN Yong-gao⁴

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Abstract

Rooted uplift pile foundation is a new type of foundation with variable cross-section with concrete roots jacking in the sidewall of caisson. Reasonable arrangement of roots could reduce construction cost while improving foundation’s bearing capacity. In an aim of enhancing the efficiency and reliability of applying rooted uplift piles in engineering, we compared the bearing capacity—to be specific, uplift displacement, axial force of pile shaft, and lateral frictional resistance—of ordinary uplift pile and rooted uplift pile in sand under different levels of vertical uplift load through model test. Results revealed that the bearing capacity of rooted uplift pile increased by 57% compared with that of ordinary uplift pile; the axial force of pile shaft changed significantly at roots; the lateral frictional resistance of the pile was transmitted from top to bottom, and reached the extreme value near the roots. In addition, setting the roots as close as possible to the bottom of pile is an effective way to improve the bearing capacity of rooted uplift pile in the premise of ensuring the strength of root not damaged and the installation of root convenient.

Key words

root uplift pile foundation / uplift loading / model test / bearing capacity / lateral frictional resistance

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GE Nan, SUN Yan, HOU Chao-qun, ZHU Da-yong, YIN Yong-gao. Model Test on Rooted Uplift Pile in Sand[J]. Journal of Changjiang River Scientific Research Institute. 2019, 36(8): 146-152 https://doi.org/10.11988/ckyyb.20180059

References

[1] MEYERHOF G G, ADMAS J I. The Ultimate Bearing Capacity of Foundations. Canadian Geotechnical Journal, 1968, 5(4): 225-244.
[2] DASH B K, PISE P J. Effect of Compressive Load on Uplift Capacity of Model Piles. Journal of Geotechnical and Geoenvironmental Engineering, 2003, 129(11): 987-992.
[3] ALAWNEH A S,MALKAWI A I H,AL-DEEKY H.Tension Tests on Smooth and Rough Model Piles in Dry Sand. Canadian Geotechnical Journal,1999,36(4):746-753.
[4] 刘文白,周健. 上拔荷载作用下桩的颗粒流数值模拟. 岩土工程学报, 2004, 26(4): 516-521.
[5] 刘文白,邓益兵,蒋建平. 上拔荷载作用下等截面桩承载性状数值模拟. 计算机辅助工程, 2007, 16(1): 13-16.
[6] 刘文白,刘兹胜,周健. 砂土中等截面桩的上拔机制分析. 岩土力学, 2009,30(增刊1):201-205.
[7] 黄锋, 李广信. 单桩在压与拔荷载下桩侧摩阻力的有限元计算研究. 工程力学, 1999,16(6):97-101.
[8] 黄锋, 李广信, 吕禾. 砂土中抗拔桩位移变形的分析. 土木工程学报, 1999,32(1):31-36.
[9] 陈小强, 赵春风, 甘爱明. 砂土中抗拔桩与抗压桩模型试验研究. 岩土力学, 2011,32(3):738-744.
[10] 邵光辉, 赵志峰, 吴正余. 托底抗拔桩承载特性的模型试验研究. 岩土工程学报, 2016,38(6):1140-1146.
[11] 殷永高. 根式基础及根式锚碇方案构思. 公路, 2007(2):46-49.
[12] 龚维明,胡丰,童小东,等.根式基础竖向承载力性能的试验研究.岩土工程学报,2008,30(12):1789-1795.
[13] 周广腾,方诗圣,李贺才. 根式基础水平承载力的弹塑性有限元分析. 路基工程, 2014(6):140-144.
[14] 龚维明, 王磊, 殷永高. 厚覆盖土层地区根式基础应用与试验研究. 土木工程学报,2015,48(增刊2):69-74.
[15] 刘彦峰,严艺薰.根键式基桩竖向承载力自平衡法试验研究.世界桥梁,2013(3):52-56.
[16] YANG C, DAI G, GONG W. Experimental Study on the Vertical Bearing Properties of a Rooted Bored Pile//American Society of Civil Engineers. Proceedings of the Fourth Geo-China International Conference,Shandong,China,July 25-27, 2016 :9-16.
[17] ROBINSKY E I, MORRISON C F. Sand Displacement and Compaction around Model Friction Piles. Canadian Geotechnical Journal, 1964, 1(2): 81-93.
[18] 罗耀武, 胡琦, 凌道盛, 等. 桩-土界面特性对砂土地基中抗拔桩承载特性影响的模型试验研究. 岩土力学, 2011, 32(3): 722-726.