Shallow Foundations - Problem 1

1. A continuous footing in sand has a width of 3 feet and the depth to the base of foundation is 3 feet. Assume angle of internal friction, phi = 30 degrees; unit weight = 120 pcf; factor of safety = 3.0; ground water level = deep; assume general shear failure and use Terzaghi's bearing capacity factors.

Determine

a. Ultimate bearing capacity, Tult
b. Net bearing capacity, Tnet
c. Allowable bearing capacity, Tall
d. Net bearing capacity if GWL = 2 feet deep
e. Net bearing capacity if GWL = 3 feet deep
f. Net bearing capacity if GWL = 4 feet deep
g. Net bearing capacity if GWL = 6 feet deep
h. Net bearing capacity if GWL = 7 feet deep

Let me know if I have missed any information in this question and/or you have any questions/concerns.