締固め粘土の動的変形係数に及ぼす繰返し載荷の影響(農業生産工学)

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The experimental results presented in this paper were obtained in course of an investigation into the relationship between the dynamic Young's modulus of compacted clay and the number of axial repeated-loading in the unconfined compression tests. All tests were carried out with cylindrical clay specimen 5cm in diameter and 10.5cm in length compacted statically at high pressures. The magnitude of repeated-loading was determined from the unconfined compression strength of soil specimens and the range of axial tresses was from 1.02kg/(cm)^2 to 2.04kg/(cm)^2. The number of load application was in the region of 0∿50000 and the frequency of repeated stress applied at a rate of 2 per sec. The cumulative effects of repeated-loading to the dynamic Young's modulus of the clay specimen measured by ultrasonic wave propagation test were found out after 10000 cycles of loading and the shear modulus was indicated results approximately similar to those of the dynamic Young's modulus but the Poisson's ratio was not effected very much. The axial deformations developed in the repeated-loading depend upon the moisture contents and the residual strains of the specimen plotted on the ε∿log N graph increase continuously after about 10000 cycles of load have been applied. The auther discusses the effects of repeated-loading in consider of strain-hardning of soils caused by the minor rearrangements of soil particles or slips at the contact points as the numder of cycles increases.
神戸大学の論文

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尾崎叡司
神戸大学農学部

締固め粘土の動的変形係数に及ぼす繰返し載荷の影響(農業生産工学)

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