PARTICLE BREAKAGE BEHAVIOR OF VOLCANIC ASH COARSE-GRAIN SOIL IN THE EMBANKMENT USING THE SHAKING MODEL TEST

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  • 振動台を用いた模型盛土斜面の崩壊実験による火山灰質粗粒土の粒子破砕挙動の把握

Abstract

<p> In this study, the particle breakage behavior of a volcanic ash coarse-grained soil, which is easily broken by external forces, was determined by elemental mechanical tests (consolidation, drainage torsional shear test, and isotropic consolidation test) and a model embankment shaking disturbance test using a shaking table, in order to understand the particle breakage behavior by drainage torsional shear and isotropic consolidation and by the collapse of the model embankment by particle size tests. The results of various grain-size tests showed that the increase factors of the content of various grain-size fractions in the drainage torsional shear process and the slip surface of the model embankment after collapse in the elemental mechanical tests were qualitatively compared, and it was found that the increase factors of the content of various grain-size fractions in the drainage torsional shear process and the slip surface of the model embankment after collapse were large for medium sand fraction, fine sand fraction and fine grain fraction, especially the fine sand fraction showed high increase factors, showing the same tendency.</p>

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