PARTICLE-CRUSHING OF A DECOMPOSED GRANITE SOIL UNDER SHEAR STRESSES

概要

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The effect of particle-crushing on the shear characteristics of a decomposed granite soil was investigated by a triaxial compression test and a repeated triaxial test. The increase in surface area, ΔS is used as the measure for the amount of particle-crushing, and it is shown that the amount of particle-crushing ΔS induced by the shear stresses has a close relation to the plastic work done W.The particle-crushing property of the sample under shear stresses is defined by the rate of increase of the surface area S to the plastic work done W (dS/dW), which is called the "particle-crushing rate" in this paper, and a close relation is found between the particle-crushing rate and the dilatancy rate or the shear strength.The particle-crushing property of the decomposed granite soil examined in this study is compared with that of a sand under high pressures (Miura et al., 1977), and it is concluded that the particle-crushing phenomenon of the decomposed granite soil under low pressures is substantially the same as the particle-crushing phenomenon of the Toyoura sand under high pressures.The particle-crushing phenomenon under repeated deviator stresses is also investigated, and it is suggested that the amount of particle-crushing ΔS is also a function of the plastic work done W.
社団法人地盤工学会の論文
1979-09-15