Three-Stage Analysis Method for Calculating the Settlement of Large-Diameter Extralong Piles
Publication: International Journal of Geomechanics
Volume 23, Issue 3
Abstract
In terms of safety, large-diameter extralong piles require highly accurate settlement prediction because of their high load-bearing capacity. According to the bearing mechanism of the large-diameter extralong pile, in this paper, a novel and scientifically accurate three-stage analysis method is proposed for predicting pile settlement based on Randolph’s study of pile forces in homogeneous soils, in view of the limitation that the accuracy of the conventional settlement calculation method is only applicable to the pile in the end-bearing frictional bearing condition. The three-stage analysis method fully considers the deformation characteristics of the pile in three different bearing states: pure friction bearing stage, end-bearing friction bearing stage, and damage stage. The critical load of TP4-1 in this paper is 9620.89 kN, and the ultimate compressive bearing capacity is 19279.09 kN, as calculated using the three-stage analysis method, and thus the three bearing states are clearly defined. The settlement under all levels of load obtained using this method can be very close to the real-case settlement, and the maximum error of the TP4-1 pile is only 0.52 mm, as observed by numerical simulation, static load test of TP4-1, and experiments on the other three test piles.
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Acknowledgments
This research was supported by the Ministry of Industry and Information Technology IoT Integrated Innovation and Convergence Application Project Fund (Grant No. 2018470), for which the authors express their sincere gratitude. The authors also thank the editors and reviewers of this paper for their suggestions and comments, which greatly improved the quality of this paper.
Notation
The following symbols are used in this paper:
- Ap
- cross-sectional area of pile;
- a
- side frictional resistance ratio;
- ai
- side frictional resistance ratio of ith pile segment;
- b
- end resistance ratio;
- bi
- end resistance ratio of ith pile segment;
- d
- pile diameter;
- Ep
- elastic modulus of pile;
- Es
- Young’s modulus of soil around pile;
- Esi
- Young’s modulus of soil in ith layer;
- Gb
- shear modulus of soil at end of pile;
- GL
- shear modulus of soil at depth L;
- L
- pile length (m);
- Li
- length of ith pile segment;
- l0
- critical pile length;
- pb
- pile end resistance;
- pbi
- end resistance of ith pile segment;
- pfb
- ultimate bearing capacity of soil at end of pile;
- ps
- pile side frictional resistance after considering softening effect;
- uncorrected side frictional resistance;
- psi
- side frictional resistance of ith pile segment;
- pt
- pile top load (kN);
- pti
- top load of ith pile segment;
- critical load (kN);
- Quk
- ultimate compressive bearing capacity of pile;
- qpk
- standard value of ultimate end resistance of pile;
- qsik1
- minimum ultimate side frictional resistance of corresponding soil layer;
- qsik2
- maximum ultimate side frictional resistance of corresponding soil layer;
- q(z)
- side frictional resistance of pile at depth z;
- Rbf
- damage ratio at end of pile;
- rm
- radius of influence of pile;
- r0
- pile radius (m);
- S
- settlement of pile top;
- Sb
- settlement caused by soil compression at end of pile;
- Sc
- settlement caused by side frictional resistance;
- Sci
- settlement caused by side frictional in ith pile segment;
- Se
- compression deformation of pile body;
- Sei
- compression deformation of ith pile segment;
- βs
- softening ratio;
- γ
- bulk density of pile (m);
- νb
- Poisson’s ratio of soil at end of pile;
- νs
- Poisson’s ratio;
- νsi
- Poisson’s ratio of soil in ith layer;
- ρ
- soil inhomogeneity factor around pile; and
- φ
- settlement correction factor.
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Information & Authors
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Published In
International Journal of Geomechanics
Volume 23 • Issue 3 • March 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Jun 16, 2022
Accepted: Oct 22, 2022
Published online: Jan 3, 2023
Published in print: Mar 1, 2023
Discussion open until: Jun 3, 2023
ASCE Technical Topics:
- Buckling
- Continuum mechanics
- Critical loads
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Foundation design
- Foundations
- Friction
- Geomechanics
- Geotechnical engineering
- Load bearing capacity
- Load tests
- Pile foundations
- Pile settlement
- Pile tests
- Soil dynamics
- Soil mechanics
- Soil settlement
- Solid mechanics
- Static loads
- Statics (mechanics)
- Structural dynamics
- Tests (by type)
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