qu=cNc+γDfNq+0.5γBNγq sub u equals c cap N sub c plus gamma cap D sub f cap N sub q plus 0.5 gamma cap B cap N sub gamma : Soil cohesion : Effective unit weight of soil : Width of the footing Dfcap D sub f : Depth of the footing : Dimensionless Terzaghi bearing capacity factors Rules of Thumb for Foundations Estimate qallq sub a l l end-sub for granular soils.
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