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Bearing capacity problem example 5

A square footing fails by general shear in a cohesionless soil under an ultimate load of Qult – 1687.5 kips. The footing is placed at a depth of 6.5 ft below ground level. Given 0 = 35°, and 7=110 Ib/ft3, determine the size of the footing if the water table is at a great depth (Fig. Ex. 5).
Solution
For a square footing [Eq. (12.17)] for c = 0, we have
Bearing capacity problem example 5 solution
 
Figure Ex. 12.5