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Piles 

GEO5

Geotechnical software

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Shear strength of skin

For each beam element of the analyzed pile the program determines the limiting value of the force that can be transmitted by the pile skin at the location of a given element. Its value depends on the geostatic stress σz found at a depth of a given element.

where: γ - unit weight of soil
h - depth below the ground surface

Summation sign denotes that σz is summed over individual layers of the soil.

The allowable shear stress is then given by:

where: c - cohesion of soil at the location of beam
φ - angle of internal friction of soil at the location of beam
k - coefficient of increase of allowable skin friction due to technology

If the beam is found below the ground water table, the allowable skin friction is then reduced to receive the form:

,

where: u - pore pressure below the ground water table

The allowable shear force then follows from:

,

where: O - length of perimeter of pile skin
l - length of pile beam

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