Room temperature creep in saturated granite
- Geological Survey, Menlo Park, CA (United States)
Cylindrical samples of granite were deformed at 26[degrees]C, constant confining pressure (60 MPa), and constant pore pressure (20 MPa). Axial and volumetric strain were determined from changes in the output of resistance foil strain gauges bonded to the rock surface. In addition, dc electrical resistivity was measured parallel to the sample axis. During each experiment (typically lasting from 1-2 weeks), the deviatoric stress [sigma] [sub d] applied to the sample was cycled between 70% and 90% of the short-term failure strength. The bulk of the experiments were conducted in tile secondary or steady state' creep regime. Inelastic volumetric strain rate was found to obey the law log[sub 10]([dot [var epsilon]][sub [upsilon]]) = A- B[sigma] [sub d] + C log[sub 10]([var epsilon][sub [upsilon]]),where B = 0.074 [plus minus] 0.003 MPa[sup [minus]1] and C[approx] [minus]4 (compressive stresses are negative). The C coefficient represents a strain-hardening-like term. The stress dependence is of the same form as the stress dependence measured for mode I crack growth in double cantilever beam experiments. The observed creep behavior is analyzed in terms of stress corrosion and crack growth models including a formulation based on energy release rate for characteristic microcracks. 50 refs., 15 figs., 3 tabs.
- OSTI ID:
- 6925292
- Journal Information:
- Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 98:B1; ISSN JGREA2; ISSN 0148-0227
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360603* -- Materials-- Properties
BEHAVIOR
CHEMICAL REACTIONS
CORROSION
CREEP
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
GRANITES
GROWTH
IGNEOUS ROCKS
MECHANICAL PROPERTIES
PHYSICAL PROPERTIES
PLUTONIC ROCKS
PORE PRESSURE
ROCKS
STRAIN RATE
STRAINS
STRESS ANALYSIS
STRESS CORROSION
STRESSES
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K