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

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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.

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Abbreviations

1/n :

geometric similarity ratio

1/i :

similarity ratio of the soil density

G s :

specific gravity

w :

moisture content

ρ :

density

e max :

maximum void ratio

e min :

minimum void ratio

D r :

relative density

d 50 :

average particle size

φ :

friction angle

E p :

Young’s modulus of real bored piles in prototype

E m :

Young’s modulus of hollow piles in model tests

E n :

Young’s modulus of embedded piles

I p :

area moment of inertia of real bored piles in prototype

I m :

area moment of inertia of hollow piles in model tests

I n :

area moment of inertia of embedded piles

EI :

bending stiffness of piles

E p I p :

bending stiffness of real bored piles in prototype

E m I m :

bending stiffness of hollow piles in model tests

E n I n :

bending stiffness of embedded piles

d :

diameter of the embedded pile

l :

length of the embedded pile

γ :

unit weight

e :

void ratio

E s :

compression modulus

E refoed :

tangent stiffness from oedometer primary loading

E ref50 :

secant stiffness in standard drained triaxial tests

E refur :

loading–unloading stiffness

c′:

effective cohesion

φ′:

effective angle of internal friction

ψ :

dilatancy angle

m :

power of stress-level dependency of stiffness

F a :

applied load

F d :

designed load

R :

ratio of applied load on main cables to designed load on main cables

N SPT :

value of standard penetration test

σ ′3 :

effective confining pressure

p ref :

referential pressure

H :

magnitude of groundwater level

z s :

burial depth of the pile-caisson composite structure

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Acknowledgements

The authors appreciate the financial support from the National Natural Science Foundation of China (Grant Nos. 51778575, 52078457).

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Authors and Affiliations

  1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou, 310058, China

    Xiaoqing Zhao, Panpan Guo & Xiaonan Gong

  2. Institute of Transportation Engineering, Zhejiang University, Hangzhou, 310058, China

    Jinchang Wang

  3. College of Civil Engineering, Hefei University of Technology, Hefei, 230009, China

    Panpan Guo

  4. China North Industries Norengeo Ltd., Shijiazhuang, 050051, China

    Yongle Duan

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  1. Xiaoqing Zhao
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  2. Jinchang Wang
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Correspondence to Jinchang Wang.

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Zhao, X., Wang, J., Guo, P. et al. Displacement and force analyses of piles in the pile-caisson composite structure under eccentric inclined loading considering different stratum features. Front. Struct. Civ. Eng. 17, 1517–1534 (2023). https://doi.org/10.1007/s11709-023-0957-y

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