TeachMeFinance.com - explain Angle of external friction (angle of wall friction)
Angle of external friction (angle of wall friction) The term 'Angle of external friction (angle of wall friction)' as it applies to the area of reclamation can be defined as ' Angle between the abscissa and the tangent of the curve representing the relationship of shearing resistance to normal stress acting between soil and surface of another material'.
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