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

摘要

The mechanical behavior of additional hard rock types under cyclic uniaxial compression and tension was studied, and a program of cyclic triaxial compression testing was initiated. All rocks (granite, sandstone, limestone, marble) exhibited cyclic fatigue characteristics in both tension and compression with fatigue strengths of 55-70% within 100,000 - 1,000,000 cycles. Prefailed granite exhibited substantial fatigue endurance. An inter-relationship between compression fatigue and the complete stress-strain curve has been demonstrated. For the same maximum stress cyclic stress amplitudes appear to affect fatigue life. In particular, indications are that compression-tension cyclic loading could be most damaging. (Author)