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It was reported that the landslide surface can be classified into the shearing type and the frictional type. This report describes the measurement of friction angle (friction coefficient) and the relation between the friction angle and the physical properties . The friction angle can be measured, using the direct shear apparatus a friction plate in it.doi:10.3313/jls1964.24.3_23 fatcat:q6iagpkgrfhmvi2b6mod6e655y