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Bearing Capacity of Soil

The general formula for determining the bearing capacity of soil is as follows: qu =cNcZc + BY'HNYZY+ σ'DNqZq WHERE qu = Ultimate bearing capacity pressure, kips per square foot (ksf) c = Soil cohesion (or undrained shear strength Cu ), ksf B = foundation width, ft W = foundation lateral length, ft Y'H = effective unit weight beneath foundation base within failure zone, kips/ft3 σ'D = effective soil or surcharge pressure at the foundation depth D, Y'D*D, ksf Y'D = effective unit weight of surcharge soil within depth D, kips/ft3 Nc ,NY ,Nq = dimensionless bearing capacity factors for cohesion c, soil weight in the failure wedge, and surcharge q terms Zc ,ZY ,Zq = dimensionless correction factors for cohesion, soil weight in the failure wedge, and surcharge q terms accounting for foundation geometry and soil type

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