Journal of Shandong University(Engineering Science) ›› 2021, Vol. 51 ›› Issue (5): 8-15.doi: 10.6040/j.issn.1672-3961.0.2021.161

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Modified calculation method of shaft friction for driven pile considering particle size effect

Peizhi ZHUANG1(),Yingchao ZHANG1,Xiuguang SONG1,He YANG1,*(),Zhicheng GUO1,2,Yan HU3   

  1. 1. School of Qilu Transportation, Shandong University, Jinan 250002, Shandong, China
    2. Lunan High Speed Railway Co., Ltd., Jinan 250102, Shandong, China
    3. Shandong High-Speed Jinan Development Co., Ltd., Jinan 250100, Shandong, China
  • Received:2021-04-09 Online:2021-10-20 Published:2021-09-29
  • Contact: He YANG E-mail:zhuangpeizhi@sdu.edu.cn;yanghesdu@mail.sdu.edu.cn

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Abstract:

This study aimed to investigate the influence of particle size on the micropile by conducting theoretical analysis and model tests. The empirical relationship between the critical friction angle and the relative roughness at the pile-soil interface was established, and thus the critical friction angle could be determined quantitively in consideration of the particle size of sands. To emphasis the influence of particle size on the additional normal stress at the soil-pile interface, the shear band at the soil-pile interface was modelled as a hollow cylinder and then a new modified method was proposed based on the elastic cavity expansion theory. Only two new parameters, Poisson's ratio and the thickness of the shear band, were involved in the modified method, which was validated by comparison with model tests. It was found that the pile shaft friction was mainly determined by the pile roughness and the ratio of pile diameter to sand median size and the critical state angle at the pile-soil interface, while the additional normal stress mainly results from the pile roughness and the ratio of pile diameter to sand median size, respectively. The research could provide the valueable reference for the bearing capacity design of micropiles.

Key words: micropile, shaft friction, particle size effect, sand, cavity expansion theory

CLC Number: 

  • TU473

Fig.1

Relationship between the interface critical state angle and relative surface roughness"

Fig.2

Analytical model of pile-soil interface shear theory"

Fig.3

Relationship between additional normal stress and the relative pile diameter"

Fig.4

Predicted scale effect of Δσrd with comparison to experimental results"

Fig.5

The calibration chamber and cone penetrator in the model tests"

Table 1

Properties of Leighton Buzzard Sand"

类型 中值粒径d50/mm 密度Gs/(103kg·m-3) 最大孔隙比emax 最小孔隙比emin 极限摩擦角φcs/(°)
FC砂 0.51 2.65 0.805 0.550 32
FE砂 0.12 2.65 1.014 0.613 32

Fig.6

Comparison of uplift shaft capacity between theoretical and experimental results"

Fig.7

Comparison of penetrations shaft capacity between theoretical and experimental results"

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