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Study of the Dynamic Stress-strain and Wave-propagation Characteristics of Soils
The general approach, physical concepts, and methods employed in the actual development of the equipment are discussed. The equipment and its capabilities are described. A brief summary of concurrent reports that describe results of studies of response in granular media is presented. The summary indicates that the significant parameters have been correctly identified from theoretical mechanics and suitably measured, since results demonstrate relationships between stress-strain behavior and propagating waves in laboratory devices. The report also summarizes the broad range of protective construction problems which lend themselves to study in this equipment. These include such studies as the effects of reflection phenomena, the effects of layered media, soil-structure interaction in a high-stress field, and the evaluation of disturbances in free-field conditions caused by the presence of a gauge. The latter is shown to be possible by virtue of the ability to measure soil response without placing a gauge in the soil or attaching one to the sample. (Author).
Tally-ho
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The Behavior of Sand in One-dimensional Compression
The behavior of sand in one-dimensional compression is investigated with both theoretical and experimental studies. The phenomenological aspects of one-dimensional behavior are discussed, such as stress-strain characteristics, energy absorption capacity, and coefficient of earth pressure at rest. The analytical study deals with the stress-strain relations of an idealized granular medium composed of elastic, equi-radii spheres in a face-centered cubic array. A new solution is derived for the behavior of the array when subjected to a monotonically increasing axial compressive stress for the comdition of zero radial strain. An experimental device is described which is capable of measuring the radial stresses developed in high-pressure, one-dimensional tests. Measurements of both the coefficient of earth pressure at rest and stressstrain properties are presented for four sands tested to an axial stress of 3,290 psi. Correlations are presented which compare the actual behavior of a rounded, uniform, quartz sand in one-dimensional and triaxial compression with the behavior suggested by the theoretical analysis. (Author).
