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Prediction of load displacement response of single piles under uplift load

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Abstract

Load displacement response and ultimate resistance of piles in sand under uplift load are predicted by load transfer approach. The pile is divided into number of segments and assigned geometrical and material properties according to actual soil pile situation. The shaft resistance is obtained analytically in accordance with existing studies. The proposed method takes into account the length, diameter and relevant surface characteristics of pile and soil properties. The load displacement characteristics and the value of uplift capacity of vertical piles from field test have been predicted. Reasonable agreement has been found out between predicted and observed values of uplift capacity. Load transfer mechanism is capable of predicting the nonlinear variation of load-displacement response of piles.

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Abbreviations

C n :

Perimeter of segment

f :

Unit shaft resistance mobilized at pile movement, z

f max :

Maximum unit shaft resistance mobilized

K u :

Coefficient of lateral earth pressure in uplift

L n :

Length of segment

Q tip(n):

Tip load for segment n

Q top(n):

Load for segment n at head

S mid(n):

Upward movement for segment n at mid point

S n :

Shaft resistance of segment

S tip(n):

Upward tip movement for segment n

z :

Amount of pile movement

z s :

Critical shaft displacement at which the maximum unit shaft resistance is mobilized

δ:

Soil pile friction angle

ΔS n :

Elastic extension of pile at mid point of segment

σv :

Vertical stress at any depth

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Correspondence to Nihar Ranjan Patra.

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Goel, S., Patra, N.R. Prediction of load displacement response of single piles under uplift load. Geotech Geol Eng 25, 57–64 (2007). https://doi.org/10.1007/s10706-006-0006-3

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