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Soil Structure Evaluation With Audiofrequency Vibrations¹

ABSTRACT

Young's moduli for soils measured with a vibrational technique varied with soil aggregate size, water content, texture, sensor-to-sample contact, and column handling. The magnitude of a Young's modulus varied from 10⁷ dynes/cm² (147 psi) for nearly saturated columns to over 10⁹ dynes/cm² for an airdried, Na-saturated silt. The accuracy of the moduli measurements is in the order of 15% to 20%. The measured values compare favorably with others previously reported in the literature for undisturbed and reworked soil samples. The range of measured soil moduli, the repeatability of the measurements, the lack of restriction on sample size and the nondestructive nature of the technique indicate that this procedure may provide a useful measure for soil structure evaluation.

¹ Contribution from the Northwest Branch, Soil & Water Conservation Research Division, ARS, USDA; Idaho Agr. Exp. Sta. cooperating.

² Research Soil Scientist, Pendleton Branch Experiment Station, Pendleton, Oregon 97801 (formerly at the Snake River Conservation Research Center, Kimberly, Idaho where research was accomplished).

Received for publication August 11, 1969. Accepted for publication October 13, 1969.