Aspects of Mechanical Behavior of Rock Under Static and Cyclic Loading. Part B. Mechanical Behavior of Rock Under Cyclic Loading
Annual technical progress rept., 29 Jan 1970-28 Feb 1972
WISCONSIN UNIV-MADISON ENGINEERING EXPERIMENT STATION
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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.
- Geology, Geochemistry and Mineralogy