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Spread Footing
Standard analysis
By default the solution proposed by J. Brinch – Hansena is used, where the bearing capacity of foundation soil follows from:
where:
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| coefficients of bearing capacity: |
 for: φ > 0
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 for: φ = 0
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| coefficients of shape of foundation: |
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| coefficients of influence of depth of foundation: |
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| coefficients of slope of loading: |
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| coefficients of slope of footing bottom: |
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| coefficients of influence of slope of terrain: |
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Notation of angles and coefficients b,g
| where: | c | - | cohesion of soil |
| q0 | - | equivalent uniform loading accounting for the influence of foundation depth | |
| d | - | depth of footing bottom | |
| γ | - | unit weight of soil above the footing bottom | |
| b | - | width of foundation | |
| γ | - | unit weight of soil | |
| Nc,Nd,Nb | - | coefficient of bearing capacity | |
| sc,sd,sb | - | coefficients of shape of foundation | |
| dc,dd,db | - | coefficients of influence of foundation depth | |
| ic,id,ib | - | coefficients of influence of slope of loading | |
| gc,gd,gb | - | coefficients of influence of slope of terrain | |
| φ | - | angle of internal friction of soil | |
| l | - | length of foundation | |
| δ | - | angle of deviation of the resultant force from the vertical direction | |
| β | - | slope of terrain | |
| α | - | slope of footing bottom |
Literature:
Brinch Hansen, J. (1970), A revised and extended formula for bearing capacity, Danish Geotechnical Institute, Bulletin 28,5-11
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