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Spread Footing 

GEO5

Geotechnical software

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Influence of foundation depth and incompressible subsoil

When computing settlement it is possible to account for the influence of foundation depth by introducing the reduction coefficient κ1:

for strip footing:      

for spread footing:

where: d - depth of footing bottom
z - depth under footing bottom

Influence of incompressible layer is introduced into the analysis by the reduction coefficient κ2:


where: zic - depth of rigid base under footing bottom
z - depth under footing bottom

Incorporating the above coefficients allows transformation of the vertical component of stress σz such that the actual depth is replaced by a substitute value zr given by:

where: κ1 - coefficient of  footing bottom depth
κ2 - coefficient of rigid base
z - depth under footing bottom

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