Experimental evaluation of a constitutive model for inelastic flow and damage evolution in solids subjected to triaxial compression

Conference · Wed Jan 01 00:00:00 EST 1992

OSTI ID:6596394

Fossum, A F; Brodsky, N S ^[1]; Chan, K S ^[2]; Munson, D E ^[3]

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1. RE/SPEC, Inc., Rapid City, SD (United States)
2. Southwest Research Inst., San Antonio, TX (United States)
3. Sandia National Labs., Albuquerque, NM (United States)

Recent concern over the potential for creep induced development of a damaged rock zone adjacent to shafts and rooms at the Waste Isolation Pilot Plant (WIPP) has motivated the formulation of a coupled constitutive description of continuum salt creep and damage. This constitutive model gives time-dependent inelastic flow and pressure-sensitive damage in crystalline solids. Initially the constitutive model was successfully used to simulate multiaxial, i.e. true triaxial, experiments obtained at relatively high, 2.5 to 20 MPa, confining pressures. Predictions of the complete creep curve, including the heretofore unmodeled tertiary creep, were also demonstrated. However, comparisons of model predictions with data were hampered because the bulk of the creep data existing on WIPP salt was intentionally obtained under confining pressures typically greater than 15 MPa, in an attempt to match the underground in situ lithostatic pressure level. It was realized that the high confining pressures suppressed tertiary creep and resulted in better defined steady state creep responses. To address the tertiary creep process directly, a number of creep tests were conducted at lower confining pressures for the explicit purpose of creating dilatant behavior.

• Research Organization: Sandia National Labs., Albuquerque, NM (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6596394
• Report Number(s): SAND-92-2185C; CONF-9306109-1; ON: DE93008351
• Resource Relation: Conference: 34. US symposium on rock mechanics, Wisconsin, MD (United States), 27-30 Jun 1993
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
ALPHA-BEARING WASTES
UNDERGROUND DISPOSAL
SALT DEPOSITS
CREEP
DAMAGE
DILATANCY
MATHEMATICAL MODELS
PRESSURE EFFECTS
STRESSES
WIPP
FUNCTIONAL MODELS
GEOLOGIC DEPOSITS
MANAGEMENT
MATERIALS
MECHANICAL PROPERTIES
NATIONAL ORGANIZATIONS
NUCLEAR FACILITIES
PILOT PLANTS
RADIOACTIVE MATERIALS
RADIOACTIVE WASTE FACILITIES
RADIOACTIVE WASTES
UNDERGROUND FACILITIES
US DOE
US ORGANIZATIONS
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES
052002* - Nuclear Fuels- Waste Disposal & Storage