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Bearing Capacity Correction for Large Footings and Mats

Bearing capacity, obtained using the basic bearing capacity equation 4-1, gives capacities that are too large for widths B > 6 ft. The 0.5 B’Z’H NZ YZ term becomes too large.

Settlement usually controls the design and loading of large dimensioned structures because the foundation soil is stressed by the applied loads to deep depths.

Bearing capacity may be corrected for large footings or mats by multiplying the surcharge term referenced above by a reduction factor.

Reduction Factor = 1 - .25log10B/6
Where B > 6



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