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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