Retaining wall earth pressure calculator (Rankine)

Set the wall height, soil unit weight, friction angle and surcharge to get the coefficient of active pressure, the pressure diagram, the thrust and where it acts.

Works in metric or imperial units.

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Questions students ask

What is the coefficient of active earth pressure?

Ka = (1 − sin φ)/(1 + sin φ) in Rankine's theory. For φ = 30°, Ka = 1/3.

Where does the active thrust act?

At H/3 above the base for a triangular pressure diagram; a surcharge adds a uniform part acting at H/2.

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