// learn
Geotechnical calculation guides
Clear explanations of the methods behind CalcGeo's applets: where the equations come from, what they assume, and how to check results by hand.
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Vertical stress beneath loads: Boussinesq vs. Westergaard
The pressure bulb explained. Point-load equations, the Newmark/Fadum rectangle corner method, superposition for points outside a footing, and three worked examples in lb, ft and psf.