安息角,内部摩擦角,空隙率に対する粒子の形状の影響

概要

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Influence of the shapes of particles on the angle and the packing properties of granular materials was studied experimentally by measurement of the reposed angle φ_r, the angle of internal friction φ_i and porosity ε, using wood particles of various shapes as non-choesive materials. It is assumed in the present paper that tan φ_r and φ_i are apparent friction factors on the plane AB of reposed pile and the plane HH of shearing tests, respectively, as shown in Fig. 1, and the spherical unevenness as shown in Fig. 2, characterizing those planes. The shape factor ψ is defined by the ratio of the diameter of inscribed sphere to the diameter of circumscribed sphere of a particle for simplicity. Under the above assumptions, it is supposed that the experimental curves of φ_r and φ_i vs. ψ have maximum values as shown in Fig. 5. These results are not necessarily indentical to that shown by Crosby^2) and Otsubo^4). The experimental curve of ε vs. ψ in Fig. 4 shows the minimum value. Nor is this result indentical to the tendency of the data shown by Shirai^3) and Crosby^2). From the above results and authors' considerations, it is suggested that particles differ from the symmetric to the un-symmetric in the angle and in the packing properties.
社団法人日本材料学会の論文
1969-06-15