4G III 28.2K/s vns-murt...urthy-pdf 11:23 AM 540 44% Х Figure Prob. 12.5 12.6 A footing of 5 ft diameter carries a safe load (including its self weight) of 80 tons in cohesionless soil (Fig. Prob. 12.6). The soil has an angle of shearing resistance = 36° and an effective unit weight of 80 lb/ft. Determine the depth of the foundation for F, 2.5 by Terzaghi's general shear failure theory. D=? T 80 son 7-80 9-36° 50 Figure Prob. 12.6 T Mac De, bec 270 Madison Avenue, New York, New York 1001 Shallow Foundation I: Ultimate Bearing Capacity 539 12.7 If the ultimate bearing capacity of a 4 ft wide strip footing resting on the surface of a sand is 5,250 lb/ft², what will be the net allowable pressure that a 10 x 10 ft square footing resting on the surface can carry with F, 3? Assume that the soil is cohesionless. Use Terzaghi's theory of general shear failure. 12.8 A circular plate of diameter 1.05 m was placed on a sand surface of unit weight 16.5 kN/m² and loaded to failure. The failure load was found to give a pressure of 1,500 kN/m². Determine the value of the bearing capacity factor N,. The angle of shearing resistance of the sand measured in a triaxial test was found to be 39. Compare this value with the theoretical value of N,. Use Terzaghi's theory of general shear failure. 12.9 Find the net allowable bearing load per foot length of a long wall footing 6 ft wide founded on a stiff saturated clay at a depth of 4 ft. The unit weight of the clay is 110 lb/ft, and the shear strength is 2500 lb/ft². Assume the load is applied rapidly such that undrained conditions (0-0) prevail. Use F, 3 and Skempton's method (Fig. Prob. 12.9). III = 88 Tools 目 Mobile View Л