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Page count: 312

Static, rapid and dynamic one-dimensional compression tests were performed on four different sands at each of three different initial relative densities. The maximum stresses attained were generally 10,000 psi or higher, except for a low-pressure dynamic test series which attained stresses from 1,000 to 1,500 psi. The results of the tests are presented in the form of plots of axial stress versus axial strain, constrained modulus versus axial stress, and radial stress versus axial stress; grain size distribution curves are also presented for each specimen for both the before- and after-test conditions. The static data were compared to Hendron's static data or the same four sands; general agreement was noted, although the compressibility was consistently somewhat higher than observed by Hendron. The radial stresses were also somewhat lower; however, the discrepancies are probably a function of the test devices and the manner of performing the test. Crushing of the sand grains was very pronounced for the coarse sands, especially the angular sand, and had an overwhelming effect on the stress-strain relationship. Consideration of sand-grain contact stresses provides a qualitative explanation for the observed behavior.