A square footing is shown in Figure 17.23. Determine the gross allowable load, Q_all, that the footing can carry. Use Terzaghi’s equation for general shear failure (F_s = 3). Given: γ = 10⁵ lb/ft³, γ_sat = 11^ο lb/ft³, c' = 0, ϕ' = 35^ο, β = 5 ft, D_f = 4 ft, and h = 2 ft.

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h Qall B Unit weight of soil y ---Groundwater table Ysat