Accession Number:

AD0751050

Title:

Aspects of Mechanical Behavior of Rock Under Static and Cyclic Loading. Part B. Mechanical Behavior of Rock Under Cyclic Loading

Descriptive Note:

Annual technical progress rept., 29 Jan 1970-28 Feb 1972

Corporate Author:

WISCONSIN UNIV-MADISON ENGINEERING EXPERIMENT STATION

Report Date:

1972-03-01

Pagination or Media Count:

97.0

Abstract:

S-N curves were obtained for a marble and a limestone in uniaxial compression and for two marbles in tension. The study of internal structure changes in rock subjected to uniaxial compression acoustic emission, optical diffraction, photomicrography revealed that cyclic fatigue is the result of a microfracturing process, consisting of grain boundary loosening in the first cycles, intragranular cracking in the following, succeeded by crack extension, coalescence, widening, fracture. Consideration of cyclic loading effects due to phenomena like earthquakes, drilling, blasting, should be incorporated in any design of underground or surface rock structures.

Subject Categories:

  • Geology, Geochemistry and Mineralogy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE