ONE-DIMENSIONAL VOLUME CHANGE CHARACTERISTICS OF SANDS UNDER VERY LOW CONFINING STRESSES

概要

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One-dimensional compression and swelling tests were conducted on loose sands under very low confining stresses including liquefied condition. The vertical effective stresses from zero to 0.3 kg/cm^2 were applied by means of vertical seepage through a column of sand 28 cm in diameter. Liquefaction of the specimens was caused by upward seepage or impact. The relationship between the void ratio and the logarithm of vertical effective stress during post-liquefaction compression was nearly linear over the stress range from 0.002 kg/cm^2 to 0.2 kg/cm^2. Even under a very low confining stress, the sand that had not undergone liquefaction was considerably less compressible than the sand that had been liquefied. The coefficient of volume change during unloading was around one-fifth of that during post-liquefaction compression for loose or very loose sand from Niigata. On the basis of the test results, the average vertical strain of a horizontal layer of sand during consolidation under its own weight following liquefaction was estimated to be on the order of a few per cent.
社団法人地盤工学会の論文
1975-09-15