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Piles
Effective stress method
The effective stress method allows for calculating the vertical bearing capacity of an isolated pile in both cohesive and non-cohesive soils. This method is suitable for drained conditions – i.e. conditions that prevail after sufficient time passed the construction.
The pile shaft resistance is given by:
| where: | qs, j | - | shaft resistance in the j-th layer |
| β p,j | - | coefficients according to Bjerrum and Burland in the j-th layer | |
| σ0, j | - | average effective stress due to overburden acting along the pile in the j-th layer | |
| Asj | - | pile shaft area in the j-th layer |
The pile base resistance is given by:
| where: | qp | - | unit pile base resistance |
| Ab | - | pile base area | |
| Np | - | pile base resistance coefficient (according Fellenius) | |
| σp | - | effective stress due to overburden acting at pile base |
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