Field test of penetration characteristics of jacked piles in layered clay

被引：0
|
作者：
Sang S. [1 ,2 ]
Bai X. [2 ,3 ]
Kong L. [1 ,2 ]
Wang Y. [2 ,3 ]
Zhang M. [2 ,3 ]
机构：
[1] School of Science, Qingdao University of Technology, Shandong, Qingdao
[2] School of Civil Engineering, Qingdao University of Technology, Shandong, Qingdao
[3] Collaborative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao University of Technology, Shandong, Qingdao
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2022年 / 41卷 / 10期
基金：
中国国家自然科学基金;
关键词：
effective radial earth pressure; excess pore water pressure; field test; jacked pile; open and closed piles; pile foundation; pile-soil interface; shaft resistances;
D O I：
10.13722/j.cnki.jrme.2021.1246
中图分类号：
学科分类号：
摘要：
In order to investigate the penetration characteristics of jacked piles in layered clay，in-situ full-scale tests of hydrostatic piles were carried out based on a pile foundation project in Dongying，Shandong Province. The variation law of the jacking force of open and closed jacked piles is analyzed，and the distribution form of the end resistance and the shift resistance of open and closed jacked piles during jacking is discussed. The distribution characteristics of the radial soil pressure and the pore water pressure at the pile-soil interface are revealed. The influence mechanism of the effective radial earth pressure on unit shaft resistances is also revealed. The test results show that the change of the jacking force basically reflects the change of soil properties，and the soft and hard degree of soil restricts the change of the jacking force. The jacking force of open piles is obviously less than that of closed piles，and the open pile accounts for 33.9%–79.7% of the closed pile at the end of jacking. The soft and hard degree of soil layers has a great influence on the pile end resistance，and the sensitivity of closed piles to the soft and hard degree of soil layer is higher than that of open piles. The development of the shaft resistances is closely related to the properties of soil layer. The shaft resistance caused by soil layer change is not obvious near the depth，and the unit shaft resistance appears obvious degradation. The increase of the soil pressure at the pile-soil interface is closely related to soil properties. The distribution forms of the pore water pressure and the excess pore water pressure are related to the permeability of soil layer. The calculation formula of the excess pore water pressure based on hydraulic fracturing theory and cylindrical pore expansion theory can better reflect the distribution characteristics of the excess pore water pressure. The ratio of the effective radial earth pressure to the unit shaft resistance is about 0.28 in silty soil layer，and 0.3 in silty clay layer. The degradation shaft resistance actually reflects the degradation of the effective radial earth pressure. © 2022 Academia Sinica. All rights reserved.
引用
下载
收藏
页码：2135 / 2148
页数：13
相关论文
共 34 条
  • [1] TEHRANI F S，, HAN F，, SALGADO R，, Et al., Effect of surface roughness on the shaft resistance of non-displacement piles embedded in sand[J], Géotechnique, 66, 5, pp. 386-400, (2016)
  • [2] Lin LI, LI Jingpei, Et al., Pile jacking-in effects considering stress anisotropy of natural clay[J], Chinese Journal of Rock Mechanics and Engineering, 35, 5, pp. 1055-1064, (2016)
  • [3] CAO Zhaohu, KONG Gangqiang, LIU Hanlong, Et al., Model tests on pipe pile penetration by using transparent soils[J], Chinese Journal of Geotechnical Engineering, 36, 8, pp. 1564-1568, (2014)
  • [4] LI Jingpei, FANG Rui, LI Lin, Variation of excess pore pressure around jacked piles considering the three-dimensional strength of soil[J], Chinese Journal of Rock Mechanics and Engineering, 35, 4, pp. 847-855, (2016)
  • [5] KOU Hailei, ZHANG Mingyi, Penetration mechanism of jacked PHC pipe piles based on pile stress measurement[J], Rock and Soil Mechanics, 35, 5, pp. 1295-1302, (2014)
  • [6] ZHANG Zhongmiao, LIU Junwei, YU Feng, Et al., Research on plugging effect of jacked prestressed concrete pipe pile[J], Rock and Soil Mechanics, 32, 8, pp. 2274-2280, (2011)
  • [7] HU Yongqiang, TANG Liansheng, LI Zhizhong, Experimental study on variation and time effect of shaft resistance of jacked pile installation[J], Journal of Sun Yat-sen University：NaturalScienceEdition, 54, 1, pp. 130-135, (2015)
  • [8] ZHANG Mingyi, DENG An'fu, Experimental study on jacked precast piles in layered soil[J], Chinese Journal of Geotechnical Engineering, 22, 4, pp. 490-492, (2000)
  • [9] HU Yongqiang, TANG Liansheng, LI Zhaoyuan, Mechanism of sliding friction at pile-soil interface of jacked pile[J], Rock and Soil Mechanics, 36, 5, pp. 1288-1294, (2015)
  • [10] ZHANG Zhongmiao, XIE Zhizhuan, LIU Junwei, Et al., The earth pressure during pile driving in silty soil with mucky soil interbed[J], Journal of Zhejiang University：Engeering Science, 45, 8, pp. 1430-1434, (2011)
1234