Time-dependent aspects of rock behavior as measured by a servocontrolled hydraulic testing machine

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

DOI:https://doi.org/10.1016/0148-9062(73)90033-8· OSTI ID:5130971

Peng, S S

The closed-loop, servocontrolled hydraulic testing machine was used to study the mechanisms of rock failure. It was found that applied load relaxes appreciably as soon as macrocracks initiated at the specimen surfaces. The behaviors of load relaxation were obtained for Berea Sandstone, Tennessee Marble, and Arkose Sandstone. The load relaxation was used to establish the residual strength and creep behavior of the fractured specimens of Tennessee Marble and Arkose Sandstone. The load relaxation was also used to explain the experimental result that the negative slopes of the postfailure curves of all 4 rock types increased with a decrease in the applied deformation rate. In addition, a fast response visicorder was used to record the rapid fracture of Charcoal Granite and Berea Sandstone. The result indicated that the testing machine was not able to follow the fracture processes due to its slow response and the high crack propagation velocity.

• Research Organization: US Bureau Mines
• OSTI ID: 5130971
• Journal Information: Int. J. Rock Mech. Min. Sci.; (United States), Journal Name: Int. J. Rock Mech. Min. Sci.; (United States) Vol. 10:3; ISSN IJRMA
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
CONTROL EQUIPMENT
CRACK PROPAGATION
CREEP
EQUIPMENT
FAILURES
FRACTURE PROPERTIES
MARBLE
MEASURING INSTRUMENTS
MECHANICAL PROPERTIES
MECHANICS
METAMORPHIC ROCKS
RELAXATION
ROCK MECHANICS
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
SERVOMECHANISMS
STRESS RELAXATION