Angle of internal friction

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Alternative term: Angle of shearing resistance

The limiting value of the angle between the reaction on a plane within a soil mass at which shearing may occur and the normal to that plane.

Note: The tangent of the angle of internal friction is the coefficient of friction for the soil.

Please note that this is the term as it stands in the original IALAInternational Association of Marine Aids to Navigation and Lighthouse Authorities - AISM Dictionary edition (1970-1989)