Improvement of Whitish Oasis Soil, Mechanical Properties of Soils
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概要
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Whitish oasis soil in China contains abundant calcium carbonate (CaCO_3). It is a highly impermeable alkaline-calcareous soil with unique mechanical properties. This paper deals with the mechanical properties of the three horizons (Ap, Bca and C) of the whitish oasis soil as an aid to understanding the draught requirements of a four-stage subsoil mixing plough for the improvement of the whitish oasis soil. Pseudogley soil, which is a typical heavy clay soil in Japan, was also tested for comparison. Tensile strength, shear strength, soil-metal friction and soil-plastic friction were determined. The results show that the tensile strength of the pseudogley soil was essentially unaffected by soil water content. The tensile strengths of the whitish oasis soil layers increased steeply at a lower soil water content. The tensile strength of the Bca horizon was the largest, followed by the C horizon, Ap horizon and pseudogley soil. Cohesion reached a maximum at a particular soil water content which was nearly the same as the appropriate plastic limit. The maximum cohesion value for the Bca horizon was the largest, followed by those for the C horizon, Ap horizon and the pseudogley soil. The tensile strength of the pseudogley soil was about one-seventh of the cohesion value, but the tensile strengths of the Bca and C horizons were greater than the cohesion values of those soils, and the tensile strength of the Ap horizon was nearly same as its cohesion. The tensile strength of soils is generally much smaller than the cohesion, but the whitish oasis soil had an extremely high tensile strength. Adhesion also reached a maximum at a particular soil water content. These soil water contents were also the same as the plastic limits. The maximum value of adhesion for the C horizon was the largest, followed by the Bca horizon, Ap horizon and the pseudogley soil. In fact, all layers of the whitish oasis soil were much stickier than the pseudogley soil. Soil adhesion to polyethylene was smaller than adhesion to steel. The soil water contents, at which the adhesion showed a maximum, were also the same as the plastic limits.
- 専修大学北海道短期大学の論文
- 2002-12-30
著者
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Araya K.
Environmental Science Laboratory Senshu University
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Guo G.
Environmental Science Laboratory, Senshu University