Properties of compacted backfill split-Hopkinson pressure bar. Final report, 1 November 1982-28 February 1985
Loading on buried structures subjected to nuclear or conventional high explosive weapons is strongly influenced by the backfill adjacent to and overlying the structure. The relative stiffness of the structure and the surrounding soil and their interactions will determine the level and extent of damage due to blast loads. White soil response may be in the laboratory, this environment must be able to reflect the type of confinements, magnitude of stress change, and the time scale of loading expected in the problem. The split-Hopkinson pressure bar (SHPB) technique has been adapted to measure the dynamic response of soil to implulse loads. This technique can significantly extend the range of stresses and strain rates that can be applied beyond the capabilities of conventional laboratory dynamic soil-testing equipment. Various assumptions and considerations involve in designing an SHPB experiment and evaluating the data with soil as a specimen are discussed in detail. Soils have low wave speeds, nonlinear hysteretic behavior, and low unconfined compressive strength which complicate SHPB testing. Insight is provided as to how these factors affect experimental accuracy and data reliability. The dynamic soil stress-strain response was found to be governed principally by the initial gas porosity of the specimen. Examples of stress-strain curves are present for specimens with applied stresses ans strain rates up to 520 MPa and 4000/s respectively.
- Research Organization:
- Utah Univ., Salt Lake City (USA). Dept. of Civil Engineering
- OSTI ID:
- 6959694
- Report Number(s):
- AD-A-173182/7/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
450100 -- Military Technology
Weaponry
& National Defense-- Chemical Explosions & Explosives
450202* -- Explosions & Explosives-- Nuclear-- Weaponry-- (-1989)
BLAST EFFECTS
CHEMICAL EXPLOSIONS
COMPACTING
DYNAMIC LOADS
EXPLOSIONS
LEVELS
MEASURING METHODS
MECHANICAL STRUCTURES
NUCLEAR EXPLOSIONS
PORE PRESSURE
POROSITY
SAND
STRAIN RATE
STRESSES
UNDERGROUND