A continuous footing is shown in Figure 16.18. Using Terzaghi's bearing-capacity factors, determine the gross allowable load per unit area (qall) that the footing can carry. Assume general shear failure. Given: ( = 17.5 kN/m3, c' = 21 kN/m2, (' = 32°, Df = 1 m, B = 1.5 m, and factor of safety = 3?

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S qall Unit weight of soil γ b'