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Coefficients of Resistance α a β

The pile base coefficient α defends on the pile type. Its value is automatically calculated according to the pile and soil types or it can be entered manually by the user.

Piles

α for sand

α dor clay

α for silt

prefabricated driven piles or steel piles

1.0

1.0

1.0

Franki piles

1.0

1.0

1.0

driven wooden piles

1.0

1.0

1.0

vibrating or vibropressed

1.0

1.0

1.0

cast in place screw piles

1.0

1.0

1.0

prefabricated screw piles

1.0

1.0

1.0

cast in place screw piles with additional grouting

1.0

1.0

1.0

prefabricated screw piles with additional grouting

1.0

1.0

1.0

steel tubular piles

1.0

1.0

1.0

Continuous Flight Auger piles (CFA)

0.3

0.3

0.3

bored piles or piles sheeted by bentonite suspense

0.5

0.85

0.6

bored piles with steel casing

0.5

0.85

0.6

The pile shaft coefficient β is automatically determined according to the pile and soil types. The values are shown in the following table:

Piles

β for sand

β for clay

β for silt

prefabricated driven piles or steel piles

1.0

1.0

1.0

Franki piles

1.0

1.0

1.0

driven wooden piles

1.0

1.0

1.0

vibrating or vibropressed

1.0

1.0

1.0

cast in place screw piles

1.0

1.0

1.0

prefabricated screw piles

1.0

1.0

1.0

cast in place screw piles with additional grouting

1.0

1.0

1.0

prefabricated screw piles with additional grouting

1.0

1.0

1.0

steel tubular piles

1.0

1.0

1.0

Continuous Flight Auger piles (CFA)

1.0

1.0

1.0

bored piles or piles sheeted by bentonite suspense

0.5

0.8

0.65

bored piles with steel casing

0.5

0.8

0.65

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