抄録
A new measuring method of shearing and normal stresses in a granular bed, and between a granular bed and a smooth, or rough plate has been herein developed, using a strain meter. The shearing strength obtained by this method is almost proportional to the normal stress, and the, kinds of friction factors, statical, maximum statical, and dynamical friction factor, are defiined by the use of the shearing diagrams from a granular bed test and a rough plate to the granular bed test. The ratio of dynamical friction factor of a rough plate to that of a smooth plate can be correlated to a modified Froude number (1-εp)U2/Dpg and the relative roughness S/Dp in an empirical equation.
