Elastic-plastic deformation of anhydrite and polyhalite as determined from quasi-static triaxial compression tests
Constant stress-rate triaxial compression experiments were performed on specimens of anhydrite and polyhalite at low confining pressure and at two temperatures. The loading rate was 5.75 x 10/sup -2/ MPa s/sup -1/; the confining pressures were 1, 5, 10, and 20 MPa and the two temperatures were 25/sup 0/C and 100/sup 0/C. The specimens were loaded to failure in a soft testing machine so that failure occurred at peak stress. Results from these experiments were used to construct yield envelopes, failure envelopes and stress-strain curves, and to determine mechanical properties. Yield, determined by the onset of dilatancy, occurs at about sixty percent of peak stress. The effect of temperature on both the yield and failure envelopes is negligible. The polyhalite specimens were found to be about twice as strong as the anhydrite specimens. The stress-strain data were fitted to a constitutive law.
- Research Organization:
- RE/SPEC, Inc., Rapid City, SD (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6407017
- Report Number(s):
- SAND-81-7063
- Country of Publication:
- United States
- Language:
- English
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ALKALINE EARTH METAL COMPOUNDS
ANHYDRITE
CALCIUM COMPOUNDS
CALCIUM SULFATES
COMPRESSION
DRILL CORES
GEOLOGIC DEPOSITS
HIGH PRESSURE
MANAGEMENT
MECHANICAL PROPERTIES
MEDIUM PRESSURE
MEDIUM TEMPERATURE
MINERALS
NEW MEXICO
NORTH AMERICA
OXYGEN COMPOUNDS
POISSON RATIO
PRESSURE DEPENDENCE
RADIOACTIVE WASTE DISPOSAL
SALT DEPOSITS
SHEAR PROPERTIES
SOUTHWEST REGION
STATIC LOADS
STRAINS
STRESSES
SULFATES
SULFUR COMPOUNDS
TEMPERATURE EFFECTS
UNDERGROUND DISPOSAL
USA
WASTE DISPOSAL
WASTE MANAGEMENT
YIELD STRENGTH
YOUNG MODULUS