Experimental study on bearing mechanism of screw cast-in-place piles under vertical loads

被引：0
|
作者：
Wang S.-G. [1 ,2 ]
Feng Z. [3 ]
Tang J.-Z. [1 ]
Zhao Z.-P. [1 ]
机构：
[1] Institute of Foundation Engineering, China Academy of Building Research, Beijing
[2] Disaster Prevention Research Center, Ministry of Housing and Urban-Rural Development, Beijing
[3] State Grid Sichuan Construction Company, Chengdu
来源：
| 1600年 / Chinese Society of Civil Engineering卷 / 43期
关键词：
Displacement feature; Field test; Model test; Screw cast-in-place pile; Vertical bearing mechanism;
D O I：
10.11779/CJGE202102019
中图分类号：
学科分类号：
摘要：
The screw cast-in-place pile is a kind of variable-section cast-in-place pile with cylindrical top and threaded bottom. Due to its special construction technology and section form, the bearing mechanism of screw piles is different from that of piles with the same section. Through the indoor model tests, the failure modes of the screw piles and the straight rod piles are obtained intuitively by using the image processing technology, and then the bearing mechanism and the calculation of the bearing capacity are discussed, and the field tests are used for verifiction. The model and field tests show that the bearing capacity of a single screw pile is higher than that of the pile with the same diameter, and the lateral resistance of the screw pile is obviously higher than that of the pile with the same diameter. The mechanism of limit lateral resistance is different between the screw segment and the straight segment. For the screw section, under the limit state, because of the teeth of mechanical interlocking between the teeth and the teeth of the soils as a whole and the shear displacement of surrounding soils, the lateral resistance is shear strength of surrounding soils, the fracture surface is continuously arch-shaped, and the average diameter of the arch section is higher than the diameter of the screw teeth. For the straight pile, under the limit state, the lateral resistance is the friction resistance between the pile body and the soils around the pile, and the failure surface is the cylinder around the pile. According to the test results, the expression for the ultimate bearing capacity of a single screw cast-in-place pile is given, and the value of the relevant parameters are suggested. © 2021, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.
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页码：383 / 389
页数：6
相关论文
共 10 条
  • [1] MENG Zhen, CHEN Jin-jian, WANG Jian-hua, Et al., Study of model test on bearing capacity of screw piles in sand, Rock and Soil Mechanics, 32, S1, pp. 141-145, (2012)
  • [2] QIAN Jian-gu, CHEN Hong-wei, JIA Peng, Et al., Experimental study of mechanical behaviors of grouting- screw pile interface, Chinese Journal of Rock Mechanics and Engineering, 32, 9, pp. 1744-1749, (2013)
  • [3] FANG Chong, ZHANG Xin-gui, PENG Gui-jiao, Discussion on the bearing force characteristic and the failure behavior of a new kind half-screw filling pile, Geotechnical Engineering Technique, 20, 6, pp. 316-319, (2006)
  • [4] GAO Jian-zhong, ZHANG Rui-song, Experimental study on static load bearing capacity of screw piles in collapsible loess area, Geotechnical Engineering Technique, 31, 3, pp. 109-114, (2017)
  • [5] PENG Kui-sen, MA Shi-cheng, Solution of load-settlement function an finite element analysis of single screw stake under axial pressure, Journal of Hunan Institute of Engineering, 20, 3, pp. 67-71, (2010)
  • [6] YANG Qian, SHEN Bao-han, The bearing mechanism and calculation method of bearing capacity of screw pile, Industrial Construction, 43, 1, pp. 67-70, (2013)
  • [7] DENG Yi-bing, ZHOU Jian, LIU Zhong, Et al., Model test study of augered piling of screw displacement auger in sand, Chinese Journal of Rock Mechanics and Engineering, 30, 12, pp. 2558-2566, (2011)
  • [8] FENG Zhe, Experimental Study on Vertical Bearing Characteristics of Screw Cast-in-Place Pile, (2019)
  • [9] RANDOLPH M F, DOLWIN J B., Design of driven pile in sand, Géotechnique, 44, 3, pp. 427-448, (1994)
  • [10] TOMLINSON M J., Pile Design and Construction Practice, (1977)
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