Abstract
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.
The relationship between the friction angle φf and the content of Bentonite Bn is shown as follows, φf=φf0exp(-Af·Bn)
where φf0 and Af are constants determined by the kinds of the clay minerals contained.
