Displacement and force analyses of piles in the pile-caisson composite structure under eccentric inclined loading considering different stratum features

doi:10.1007/s11709-023-0957-y

Frontiers of Structural and Civil Engineering

2023, Vol. 17

Issue (10): 1517-1534 https://doi.org/10.1007/s11709-023-0957-y

本期目录

Displacement and force analyses of piles in the pile-caisson composite structure under eccentric inclined loading considering different stratum features

Xiaoqing ZHAO¹, Jinchang WANG²(

), Panpan GUO^1,³, Xiaonan GONG¹, Yongle DUAN⁴

¹. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
². Institute of Transportation Engineering, Zhejiang University, Hangzhou 310058, China
³. College of Civil Engineering, Hefei University of Technology, Hefei 230009, China
⁴. China North Industries Norengeo Ltd., Shijiazhuang 050051, China

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Abstract：

A novel anchorage for long-span suspension bridges, called pile-caisson composite structures, was recently proposed by the authors in an attempt to reduce the construction period and costs. This study aims to investigate the displacement and force behavior of piles in a pile-caisson composite structure under eccentric inclined loading considering different stratum features. To this end, both 1g model tests and three-dimensional numerical simulations were performed. Two groups of 1g model tests were used to validate the finite-element (FE) method. Parametric studies were then performed to investigate the effects of groundwater level, burial depth of the pile-caisson composite structure, and distribution of soil layers on the performance of the pile-caisson composite structure. The numerical analyses indicated that the influence of the groundwater level on the stability of the caisson was much greater than that of the piles. In addition, increasing the burial depth of the pile-caisson composite structure can assist in reducing the displacements and improving the stability of the pile-caisson composite structure. In addition, the distribution of soil layers can significantly affect the stability of the pile-caisson composite structure, especially the soil layer around the caisson.

Key words： composite structure piles foundation suspension bridge 1g model test finite-element analysis

收稿日期: 2022-07-04 出版日期: 2024-01-15

Corresponding Author(s): Jinchang WANG

引用本文:

. [J]. Frontiers of Structural and Civil Engineering, 2023, 17(10): 1517-1534.
Xiaoqing ZHAO, Jinchang WANG, Panpan GUO, Xiaonan GONG, Yongle DUAN. Displacement and force analyses of piles in the pile-caisson composite structure under eccentric inclined loading considering different stratum features. Front. Struct. Civ. Eng., 2023, 17(10): 1517-1534.

链接本文:

https://academic.hep.com.cn/fsce/CN/10.1007/s11709-023-0957-y
https://academic.hep.com.cn/fsce/CN/Y2023/V17/I10/1517

Fig.1

Tab.1

Fig.2

Fig.3

parameter	value
specific gravity, G_s	2.68
moisture content, w	0.63%
density, ρ (g/cm³)	1.56
maximum void ratio, e_max	0.881
minimum void ratio, e_min	0.597
relative density, D_r	59.61%
average particle size, d₅₀ (mm)	0.28
friction angle, $φ$ (° )	34.5

Tab.2

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

parameter	value
d (cm)	2.0
L (cm)	45
$E p$ (MPa)	1.032
$E p I p$ (MN·m²)	1.013 × 10⁵

Tab.3

parameter	value
$γ$ (kN/m³)	15.6
$e$	0.718
$E s$ (MPa)	10.2
$E oed ref$ (MPa)	10.2
$E 50 ref$ (MPa)	10.2
$E ur ref$ (MPa)	51.0
$c ′$ (kPa)	0
$φ ′$ (° )	34.5
$ψ$	4.5
$m$	0.5

Tab.4

Fig.10

Fig.11

Fig.12

Fig.13

Fig.14

Fig.15

Fig.16

Fig.17

Fig.18

Fig.19

Fig.20

parameter	clay	sand
$γ$ (kN/m³)	18.1	19.6
e	0.736	0.71
$E s$ (MPa)	3.73	11.57
$E oed ref$ (MPa)	3.73	11.57
$E 50 ref$ (MPa)	7.46	11.57
$E ur ref$ (MPa)	18.65	57.85
$c ′$ (kPa)	7	3
$φ ′$ (° )	25	34
$ψ$	0	4
$m$	0.8	0.5

Tab.5

Fig.21

Fig.22

Fig.23

Fig.24

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