TECHNIQUES AND EQUIPMENT FOR DETERMINING DYNAMIC PROPERTIES OF SOILS.
UNITED RESEARCH SERVICES CORP BURLINGAME CALIF
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Equipment was designed, developed, and employed in a program of testing granular materials. In addition, a small effort was expended to outline a technique for constructing mathematical models founded on the discrete nature of soils. To date, equipment and techniques have been devised with which cylin drical samples can be loaded to peak stress levels as high as 3,000 psi within times of about 1 millisecond. The bulk of the testing completed has been on three dry, granular, cohesionless, particle assemblages--many-faceted but well-rounded sand grains 20-30 Ottawa, highly angular sand grains 20-32, and highly spherical glass grains 30-40 and 80-100. Efforts to date have been aimed at determining the relative importance of various media, loading, and boundary parameters on response. This report is an attempt at a summary statement of the effects of such parameters as sample length, density, and moisture content particle material, size, and shape stress level, rate of stress rise, overstress, hold time, and unloading and boundary lateral restraint. Author