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 |
© GeoStru