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Title: Transient creep of repository rocks. Mechanistic creep laws for rock salt. Final report

Abstract

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.

Authors:
; ;
Publication Date:
Research Org.:
Texas A and M Univ., College Station (USA). Research Foundation
OSTI Identifier:
6497078
Report Number(s):
BMI/ONWI-550
ON: DE85000788
DOE Contract Number:  
AC02-83CH10140
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; SALT DEPOSITS; CREEP; COMPRESSION STRENGTH; EXPERIMENTAL DATA; HIGH-LEVEL RADIOACTIVE WASTES; MEDIUM TEMPERATURE; PRESSURE DEPENDENCE; RADIOACTIVE WASTE DISPOSAL; STRAIN RATE; STRAINS; TEMPERATURE DEPENDENCE; VERY HIGH TEMPERATURE; DATA; GEOLOGIC DEPOSITS; INFORMATION; MANAGEMENT; MATERIALS; MECHANICAL PROPERTIES; NUMERICAL DATA; RADIOACTIVE MATERIALS; RADIOACTIVE WASTES; WASTE DISPOSAL; WASTE MANAGEMENT; WASTES; 580300* - Mineralogy, Petrology, & Rock Mechanics- (-1989); 052002 - Nuclear Fuels- Waste Disposal & Storage

Citation Formats

Handin, J., Russell, J.E., and Carter, N.L. Transient creep of repository rocks. Mechanistic creep laws for rock salt. Final report. United States: N. p., 1984. Web.
Handin, J., Russell, J.E., & Carter, N.L. Transient creep of repository rocks. Mechanistic creep laws for rock salt. Final report. United States.
Handin, J., Russell, J.E., and Carter, N.L. Sat . "Transient creep of repository rocks. Mechanistic creep laws for rock salt. Final report". United States.
@article{osti_6497078,
title = {Transient creep of repository rocks. Mechanistic creep laws for rock salt. Final report},
author = {Handin, J. and Russell, J.E. and Carter, N.L.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {9}
}

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