Abstract
An analytical method has been proposed to predict the ultimate uplift capacity of single vertical piles embedded in sand considering arching effect. The present analysis takes into consideration of various pile and soil parameters such as length (L), diameter (d) of the pile, angle of internal friction of soil (ϕ), soil pile friction angle (δ) and unit weight of soil (γ). A modified value of coefficient of lateral earth pressure in uplift has been developed considering the arching effect of soil. A comparative assessment of the uplift capacity of piles predicted by using proposed theory and the existing available theories is made with the existing field and model test results. It has been observed that the present model considering the arching effect predicts the results closer.
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Abbreviations
- d :
-
Pile diameter
- K s :
-
Lateral earth pressure coefficient
- K awn :
-
New active lateral stress ratio proposed in this study
- L :
-
Length of pile
- P u :
-
Ultimate uplift capacity of pile
- Δz :
-
Thickness of wedge element
- B :
-
Width of failure surface
- H :
-
Height of the wall
- K awn :
-
Coefficient of lateral earth pressure considering arching
- ΔT :
-
Shear stress at the interface of failure surface
- ΔQ :
-
Normal stress acting on the differential flat surface
- x :
-
Differential length along the failure surface
- ϕ :
-
Internal friction angle of backfill
- δ :
-
Friction angle of at the interface of soil and pile
- γ :
-
Unit weight of soil
- θ :
-
Angle of rotation of principal stresses at wall
- σ 1, σ 3 :
-
Major and minor principal stress
- σ ah :
-
Active lateral stress at arbitrary point on differential flat element
- σ ahw :
-
Active lateral stress at wall
- σ vw :
-
Vertical stress across on differential flat element
- \( \bar \sigma _{v} \) :
-
Average value of σ v over differential flat element
- τ f :
-
Frictional resistance at the slip surface
- τ w :
-
Frictional resistance at the interface
- ψ :
-
Angle of inclination of failure surface
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Shelke, A., Patra, N.R. Effect of Arching on Uplift Capacity of Single Piles. Geotech Geol Eng 27, 365–377 (2009). https://doi.org/10.1007/s10706-008-9236-x
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DOI: https://doi.org/10.1007/s10706-008-9236-x