CALIBRATION OF A VERTICAL SHOCK TUBE AND ITS ASSOCIATED SOIL BIN.
Technical rept., May 65-Jul 66,
NEW MEXICO UNIV ALBUQUERQUE ERIC H WANG CIVIL ENGINEERING RESEARCH FACILITY
Pagination or Media Count:
This report covers the results of experiments performed to calibrate the Civil Engineering Research Facility 2-foot by 40-foot vertical shock tube and its associated soil bin when filled with dense 20-30 Ottawa sand. The objective of the research was to vary the amount of Primacord PETN detonated in the shock tube and to measure air shock velocity, incident pressure, reflected pressure versus time, soil wavefront velocity, soil stress versus time, and soil strain versus time. The intent of this research was to accumulate data over the full range of safe, shock-tube-driver charges so that investigators using the same equipment in the future would have a good estimate of what to expect and could plan their tests accordingly. It was anticipated that future investigators using this equipment would include those interested in studies involving dynamic soil-structure interaction, one-dimensional wave propagation, and soil gage evaluation or calibration. The precision of this calibration was limited by the ability to measure shock pressures in air, and stress and strain in dense sand. Since at the time of these experimentations precise measurements of any of these quantities were not feasible, a large quantity of data was averaged to serve as the best possible calibration and also to give some idea of the scatter to be expected from such instrumentation. Displacement versus time records derived from the strain versus time records are included. By differentiation of displacement versus time records, estimates of peak particle velocity were possible.
- Soil Mechanics
- Test Facilities, Equipment and Methods