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The effects on the density of sand due to operating a surface vibrator at the resonant frequency of the vibrator-soil system are described. Experiments with a Lazan oscillator on a sand pit 10 ft square by 6 ft deep are outlined, and an empirical formula for predicting resonance, showing the effects of the various parameters, is presented. The results of check tests on beach sand at three sites and with different sizes of oscillators are given. The increases in density due to the operation of both large and small oscillators show that densities of from 90 to 95 per cent of a modified AASHO maximum density may be obtained in a few seconds to depths of twice the width of the oscillator.
Converse, Frederick J.
Professor of Soil Mechanics, California Institute of Technology, Pasadena, Calif.