Direct Determination of Rheological Characteristics of Debris Flow

(4) 0 dy where t = shear stress; t0 = Bingham yield stress; m = dynamic viscosity; and du/dy = shear rate. Then, adding coarse particles successively, the concentration of coarse particles was 0.1, 0.2, 0.25, 0.3, and 0.35, respectively, and the average diameter was 0.55, 1.01, 1.18, and 1.63 mm, respectively. The sedimentations were observed at the range of shear rate 20‐56 s 21 . The larger the effective concentration of slurry, the larger the shear rate of sedimentation. The larger the diameter of coarse particles, the smaller the shear rate of sedimentation. The model of O’Brien and Julien as described by Julien and Lan (1991) was fitted to the rheological curves of nonsedimentation: 2 du du t = t 1 h 1 z (5) y SD dy dy

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