The effect of loading waveform on the pre- and post- failure fatigue properties of sandstone subjected to uniaxial cyclic loading was investigated. The sinusoidal, ramp and square waveforms were used at cyclic loading frequency of 5Hz and peak amplitude of 0.05 mm. The loading waveform was found to be of the great significance and affected the fatigue behaviour. Fatigue behaviour was found to be a function of the dynamic energy of the load and the shape of the waveform. Damage accumulateed most rapidly under square waveforms with a high energy requirement. A ramp waveform was the least damaging of those considered. This study has practical significance in understanding the behaviour of rock and rock masses within the excavation systems subjected to dynamic cyclic loads.
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