Transient creep of repository rocks. Mechanistic creep laws for rock salt. Final report
We have tested 10 by 20-cm cores of Avery Island rocksalt in triaxial compression at confining pressure of 3.4 and 20 MPa, temperature of 100/sup 0/C, 150/sup 0/C, and 200/sup 0/C, and constant strain rates of 10/sup -4/, 10/sup -5/, and 10/sup -6/s/sup -1/. Neglecting the small effect of confining pressure, we have fit our data to a semi-empirical constitutive model that relates differential stress to strain, strain rate, and absolute temperature. This model rather well predicts the results of relaxation (nearly constant strain) tests as well as constant-stress-rate and constant-stress (creep) tests. Furthermore, even though stress-strain curves reflect the strain hardening that corresponds to transient creep, our model also predicts the steady-state flow stresses measured in creep tests under comparable conditions. Comparing the response of coarse-grained (8 mm) natural rocksalt, fine-grained (0.3 mm) synthetic aggregates, and halite single crystals has revealed that although the effect of grain size alone is small, the influences of substructure (e.g., subgrain size and dislocation density) and impurities (especially brine) may well be large and certainly deserve further investigation.
- Research Organization:
- Texas A and M Univ., College Station (USA). Research Foundation
- DOE Contract Number:
- AC02-83CH10140
- OSTI ID:
- 6497078
- Report Number(s):
- BMI/ONWI-550; ON: DE85000788
- Country of Publication:
- United States
- Language:
- English
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