Mechanical equation of state for brittle rock. Pt. 2. The prefailure initiation behavior of brittle rock

Journal Article · Sun Jul 01 04:00:00 EDT 1973 · Int. J. Rock Mech. Min. Sci.; (United States)

DOI:https://doi.org/10.1016/0148-9062(73)90040-5· OSTI ID:7082995

Brady, B T

Results are presented of a theoretical and experimental study of the mechanical behavior of brittle rock within the pre-failure initiation region. The pre-failure initiation region includes region I and II behavior and is defined to represent the behavior of rock where no noticeable crack growth has occurred within the rock; that is, where there is no measurable deviation of the stress-volumetric strain curve from linearity during region II. Thus, only the influence of open and closed cracks, initially present within the rock on the overall behavior of the rock is considered. It is shown that the constitutive relationships of brittle rock in the pre-failure initiation region can be described by 6 equations relating the 3 principal stresses and 6 principal strains resulting from closure of open cracks (''op'' deformation mode) and frictional sliding along suitably oriented closed cracks (''cls'' deformation mode). Experimental data for Westerly granite deformed under uniaxial, triaxial, and biaxial loading is used to check the theoretical model. The results of these tests indicate that for engineering purposes, the behavior of rock under multiaxial loading can be predicted accurately once the behavior of the rock under uniaxial and triaxial loading has been determined. (11 refs.)

• Research Organization: US Bureau Mines
• OSTI ID: 7082995
• Journal Information: Int. J. Rock Mech. Min. Sci.; (United States), Journal Name: Int. J. Rock Mech. Min. Sci.; (United States) Vol. 10:4; ISSN IJRMA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603 -- Materials-- Properties
58 GEOSCIENCES
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
BRITTLENESS
COMPARATIVE EVALUATIONS
DATA
EXPERIMENTAL DATA
FRACTURE PROPERTIES
FRICTION
GRANITES
IGNEOUS ROCKS
INFORMATION
MECHANICAL PROPERTIES
MECHANICS
NUMERICAL DATA
PLUTONIC ROCKS
RESERVOIR ROCK
ROCK MECHANICS
ROCKS
SLIDING FRICTION
THEORETICAL DATA