THE ENERGY ABSORPTION CAPACITY OF GRANULAR MATERIALS IN ONE-DIMENSIONAL COMPRESION
ILLINOIS UNIV AT URBANA-CHAMAPIGN
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Energy absorbing mechanisms in sand subjected to one-dimensional compression are reported. For pressures below crushing of the grains, a granular medium of equal radii elastic spheres in a face-centered cubic array is analyzed. Expressions are obtained for the axial stress-strain curve, constrained modulus, coefficient of earth pressure at rest, and relationship between absorbed energy and input energy for one cycle of loading. The energy absorbed as a result of crushing is considered by analyzing statistical relationships between changes in grain size distribution curves and the new surface areas created. An apparatus is described which has the capability of maintaining conditions at zero radial strain under in- creasing axial stress. The lateral stresses developed under these conditions are measured. Preliminary experimental results are presented for one sand which show the variation of the coefficient of earth pressure at rest and the stress- strain relationships with initial void ratio, over consolidation ratio, and strain rate. A correlation of theory and test results is presented.
- Soil Mechanics