土壌ペーストの流動 (III)

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タイトル別名
  • Rheology of Soil Paste (III)
  • ドジョウ ペースト ノ リュウドウ 3

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The previous paper indicated that the soil paste was considered to be Bingham body and thixotropic. It also said the yield value increased exponentially with the concentration of soil. In this paper, the flow properties of mixtures (soil and soil; soil and polymer) were examined. The results are as follows.<BR>1) Many kinds of soil paste behave as thixotropy-flow at a constant shear rate and as shear rate thixotropy-flow in consistency curve, but that of the subsoil of the Kanto. Loam (diluvial volcanic ash soil) behaves as negative thixotropy-flow and as negative shear rate thixotropy-flow (Figs. 1, 2). The difference in flow-properties among the soils derive from the difference in the amount of high pF water content of soils. The subsoil of the Kanto Loam has a large amount of soil water in the range of high pF (<pF 4.2).<BR>2) The yield value of the mixture of courser soil (B) and finer soil (A) has a minimum value at a certain ratio of A and B (Fig. 6). The decrease in the yield value is due to the degree of packing of B in A, which has no influence on the yield value.<BR>3) The suspension of polymers has a yield value, and the relation between the yield value and the concentration rate of polymers is similar to that in the soil paste (Fig. 4). The yield value increases as the concentration rate of the polymer goes up as seen in the sigmoid line (Fig. 5).<BR>4) The kinetic units of the soil paste or mixture is determined by the force applied to the paste or mixture. And the flow starts in the water that is freed by the force.

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