Effect of strain rates from 10/sup -2/ to 10 sec/sup -1/ in triaxial compression tests on three rocks
Journal Article
·
· Int. J. Rock Mech. Min. Sci. Geomech. Abstr.; (United States)
Room-temperature, compression tests at strain rates from 10/sup -2/ to 10 sec/sup -1/ have been run on Charcoal Granodiorite to 0.45 GPa confining pressure and on Berea Sandstone and Indiana Limestone to 0.25 GPa confining pressure. For each rock at each confining pressure, the differential stress at failure is relatively constant up to a strain rate of 1 sec/sup -1/ and apparently increases abruptly above this strain rate. Dynamic analysis of the testing apparatus indicates that the apparent sudden increase in strength is due to machine inertia and does not reflect a real increase in the strength of the rocks. Taking inertia into account, the actual failure stresses of the three rocks are relatively independent of strain rate betweeen 10/sup -2/ and 10 sec/sup -1/. In the same interval, the strains at which the unconfined rocks begin to fragment tend to be lower at higher strain rates. The combination of decreasing strains and relatively constant stresses with increasing strain rate suggests that the energy necessary to fragment the unconfined rocks is lower at higher strain rates.
- Research Organization:
- Science Applications, Inc., Steamboat Springs, CO
- OSTI ID:
- 6641398
- Journal Information:
- Int. J. Rock Mech. Min. Sci. Geomech. Abstr.; (United States), Journal Name: Int. J. Rock Mech. Min. Sci. Geomech. Abstr.; (United States) Vol. 18:1; ISSN IRMGB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
AMBIENT TEMPERATURE
CARBONATE ROCKS
COMPRESSION STRENGTH
DATA
EXPERIMENTAL DATA
GRANITES
GRANODIORITES
IGNEOUS ROCKS
INFORMATION
LIMESTONE
MECHANICAL PROPERTIES
NUMERICAL DATA
PLUTONIC ROCKS
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
STRAIN RATE
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
AMBIENT TEMPERATURE
CARBONATE ROCKS
COMPRESSION STRENGTH
DATA
EXPERIMENTAL DATA
GRANITES
GRANODIORITES
IGNEOUS ROCKS
INFORMATION
LIMESTONE
MECHANICAL PROPERTIES
NUMERICAL DATA
PLUTONIC ROCKS
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
STRAIN RATE