FIGURE 6.6 Bearing capacity factors Ng , Nq, and Nc that do not include allowance for
punching shear failure. [Note: For punching shear of loose sands or soft clays, the value of
f to be used in this figure = tan–1 (0.67 tan f) and the cohesion used in the bearing capacity
equation = 0.67 c]. (Reproduced from NAVFAC DM-7.2, 1982.)