EVALUATION OF THE 4-FOOT DIAMETER, 1500-KIP-CAPACITY DYNAMIC LOAD GENERATOR.
Rept. for Jun 63-Mar 68,
ILLINOIS UNIV AT URBANA
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An experimental investigation was conducted to define and evaluate the operating characteristics of the Dynamic Load Generator DLG, a pneumatic loading device for laboratory investigation of the effects of dynamic loads on soil and buried structural models, and to investigate the response of soil specimens loaded dynamically. Four soil specimens, 4 feet in diameter and 8 feet deep, were constructed of 20-30 Ottawa sand. Two soil specimens were loaded statically to approximately 400 psi in order to determine the magnitude of the boundary frictional force between the soil specimen and the specimen container. Two soil specimens were loaded statically to approximately 900 psi and subsequently loaded dynamically with helium gas in order to investigate the response of the DLG and the soil specimens at nominal surface pressure levels of 75, 250, and 575 psi. Two profiles for the surface pressure, which had different dwell times, were utilized at each surface pressure level. In addition, the control of the rise and decay times of the surface pressure profile was investigated at the 250 psi surface pressure level. From the measurements of the surface pressures, strains in the specimen container, and stresses and arrival times in the soil specimen, it was concluded that 1 the DLG is suitable for one-dimensional compression, wave propagation, and interaction studies in soil 2 the rise, dwell, and decay times of a surface pressure profile and 3 the arrival times, stress attenuations, and stress reflections in the soil specimen were generally predictable by existing theories. Author
- Soil Mechanics
- Test Facilities, Equipment and Methods