COMPACTION OF DRY SAND BY VIBRATION IN HORIZONTAL DIRECTION

概要

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Dry sand was compacted by vibration in horizontal direction. A vibrating plate was set vertically at one end of a box, and the plate was excited by a vibrator. Settlement of sand and vibration within sand were measured.Followings were obtained by the experiments.1) The ratio of settlement at certain elapsed time to the settlement at 8 minutes (called "settlement ratio") for constant frequency was constant regardless of the horizontal distance and the value of frequency.2) Vibrating plate showed a characteristic of resonance, but it was not considered to be in full contact with the sand at higher frequencies than 1,500 rpm. And the resonance frequency did not change when a shorter box was used.3) Settlement-frequency relation could be divided into two parts, one was the range below the resonance and the other was over 1,500 rpm. In practical problems, the latter range of frequency has been used and considered to be effective.4) Higher harmonics in the wave may play an important role in compaction of dry sand.5) The vibrator elements which govern the settlement of sand in the range from about 1,500 rpm to 1,800 rpm were considered to be the product of eccentric moment and angular velocity.
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