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Lateral bearing capacity is calculated using method A proposed by Tomlinson (1971) according to the following:
Al = Lateral pile surface
fw = Correction factor connected to the conic form of the pile. i.e. the percentage diminution of the pile diameter.
c = Average cohesion value (or shear resistance in undrained conditions).
s = Effective vertical pressure of the terrain.
K= Coefficient of horizontal thrust. This depends on the technique of the pile and on the previous compaction state and is calculated as :
•For driven piles
or may be selected, in concrete cases, from the following table:
Palo 
K values 


Loose Soils 
Dense Soils 

Steel 
0.5 
1 

Prescast. Concrete 
1 
2 

Wood 
1 
3 
•For drilled piles
δ = Friction between pile and soil. A function of the roughness of the pile surface:
•For driven piles
•For drilled piles
α = Adhesion coefficient obtained from the following guidelines
•For drilled piles
 Caquot – Kerisel
 Meyerhof – Murdock (1963)
 Whitaker – Cooke (1966)
 Woodward (1961)
•For driven piles
2.5 ≤ c < 5 t/m2 
α = 1.00 
5 ≤ c < 10 
α = 0.70 
10 ≤ c < 15 
α = 0.50 
15 ≤ c < 20 
α = 0.40 
c ≥ 20 
α = 0.30 
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