Caisson-Bored Pile Composite Anchorage Foundation for Long-Span Suspension Bridge: Feasibility Study and Parametric Analysis
Publication: Journal of Bridge Engineering
Volume 27, Issue 12
Abstract
This paper proposes a novel form of gravity foundation for long-span suspension bridges. The foundation combines a caisson with bored piles and thereafter is termed a caisson-bored pile composite anchorage (CBPCA) foundation. Based on a typical suspension bridge case study with traditional caisson foundation, the feasibility of the proposed foundation was evaluated. To further capture the performance of the CBPCA foundation, three-dimensional (3D) finite-element analyses were performed. The 3D finite-element method (FEM) was validated by comparing the simulated horizontal displacements of a nine-pile group with the reported field monitoring data. Parametric studies were also conducted to investigate the effects of various parameters associated with bored piles on the CBPCA foundation performance. The numerical analysis results indicate that increasing the pile diameter can significantly reduce the horizontal displacements of the theoretical joint point (TJP) and the structural forces of bored piles. In addition, the effect of the pile arrangement was also studied. The feasibility of reducing construction time and costs by adjusting the length of some bored piles was also discussed. Moreover, the soil strength has a great influence on the stability of the CBPCA foundation, implying that it may be not suitable for soft soil conditions, namely, a soil strength ratio smaller than 0.4 in this study.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China [Grant Numbers 51778575, 52078457]; and the Science and Technology Plan Project of Department of Transportation of Zhejiang Province [Grant Number 2020050].
Notation
The following symbols are used in this paper:
- c′
- effective cohesion;
- cu
- undrained shear strength;
- D
- bored Pile diameter;
- E
- modulus of elasticity of bored pile;
- E′
- effective Young’s modulus of medium-weathered sandstone;
- tangent stiffness from primary oedometer loading;
- secant stiffness in standard drained triaxial test;
- unloading/reloading stiffness;
- E50
- secant stiffness;
- e
- void ratio;
- Fa
- applied load on the main cables;
- Fd
- designed load on the main cables;
- L
- bored pile length;
- m
- power of stress-level dependency of stiffness;
- NSPT
- value of standard penetration test;
- pref
- reference pressure;
- Rs
- soil strength ratio;
- R
- ratio of the applied load on the main cables to the designed load on the main cables;
- Rinter
- interface reduction factor;
- Rm
- maximum R-value;
- Z
- depth of bored Pile blow caisson bottom;
- γ
- unit weight;
- effective confining stress;
- υ′
- effective Poisson’s ratio of medium-weathered sandstone;
- φ′
- effective angle of internal friction; and
- ψ
- dilatancy angle.
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Published In
Journal of Bridge Engineering
Volume 27 • Issue 12 • December 2022
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© 2022 American Society of Civil Engineers.
History
Received: Feb 10, 2022
Accepted: Aug 7, 2022
Published online: Oct 10, 2022
Published in print: Dec 1, 2022
Discussion open until: Mar 10, 2023
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Cited by
- Xiaoqing Zhao, Xiaonan Gong, Yongle Duan, Panpan Guo, Load-bearing performance of caisson-bored pile composite anchorage foundation for long-span suspension bridge: 1-g model tests, Acta Geotechnica, 10.1007/s11440-023-01808-5, (2023).