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Rebound of Five One-Dimensionally Compressed Unsaturated Granular Soils¹

ABSTRACT

Rebound (decrease in bulk density after removal of mechanical stress) of five agricultural soils from four soil orders was measured at stresses of 1,000, 5,000 and 10,000 g cm^–2 and pore water pressures from 0 to –1 bar.

Rebound was usually < 0.05 g cm^–3. It was larger in soils containing expanding clays than in soils containing nonexpanding clays. It increased with stress in soils containing expanding clays but not in soils containing nonexpanding clays. Rebound decreased with repeated loading. It could not be delineated in terms of soil type, pore water pressure, or water content. In the prediction of bulk density of unsaturated agricultural soils based on their compression characteristics, rebound is usually small enough that it can be neglected.

¹ Contribution from the Soil Science Dep., Univ. of Minnesota, and the Soil & Water Management Research Unit, SEA-AR-USDA, St. Paul, Minn., in cooperation with the Minnesota Agric. Exp. St., Paper no. 10,863, Scientific Journal Series.

² Research Assistant, Univ. of Minn., now located at Iowa State Univ., Ames, Iowa; Soil Scientist, USDA, SEA-AR, and Professor, Univ. of Minn., St. Paul, Mn 55108.

Received for publication December 6, 1979. Accepted for publication January 21, 1980.