Measurements of stress and strain during one-dimensional compression of large compacted soil and rockfill specimens
Emerson, M. W. C.; Hendron, Alfred Joseph.
Contract ReportAbstract: A testing device which is capable of testing one-dimensional compression specimens 48 inches in diameter and up to 14 inches in height was developed as a part of this study. The device is capable of developing static axial pressures of 1600 psi and dynamic axial pressures of at least 800 psi with pressure-rise times as fast as 3 msec with cold gas used as the loading medium. The load is applied to the test specimen by means of a flexible diaphragm, and deflections are measured by monitoring the movement of the top surface of the test specimen relative to the bottom surface with a slide wire gage which is mounted below the test specimen. The pore water pressures may be measured and the water content of the test specimen may be altered during a test if desired. The testing device was proof-tested following construction by a series of calibration tests and a series of static and dynamic tests employing Ottawa sand as a standard. Subsequent to the proof-testing of the testing device, an experimental study was conducted to investigate the effects of the variation of certain parameters on the one-dimensional compression characteristics of granular materials and included tests on ottawa sand, crushed limestone, Wabash River gravel, and North Dakota river gravel. The study was, in general, limited to a stress range of from 0 to 500 psi, although some tests were carried to 1000 psi. The variation of parameter study included investigation into: (1.) the effect of variation of particle shape and composition; (2.) the effect of variation of particle size; (3.) the effect of variation of gradation; (4.) the effect of saturation prior to and subsequent to load application; and (5.) the effect of rate of loading. NOTE: This file is large. Allow your browser several minutes to download the file.
U.S. Army Engineer Waterways Experiment Station.Engineer Research and Development Center (U.S.)
Dynamic tests; Dynamic testing; Laboratory equipment; One-dimensional compression tests; Rock test specimens; Soil test specimens; Static tests; Strain measurement; Stress measurement; Test equipment; Soil mechanics; Rockfill; Rock mechanics
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