Acoustic emission characteristics of marble under uniaxial cyclic loading

Intractable rock engineering problems encountered in practice are related to the behavior of rocks under different cyclic loadings, the damage evolution of rock subjected to cyclic loading is important for rock engineering design and construction. Three different cyclic loadings were conducted on marble to explore the acoustic emission (AE) parameters evolution during damage. It was found that the continuous decreasing correlation dimension and b value can be deemed as robust signal of the imminent rock failure. The additional cyclic loadings increase the AE events with low energy. The Realistic Failure Process Analysis (RFPA(2D)) code was implemented to reproduce the AE distribution evolution of the corresponding experiments. Numerical simulations indicate that the AE distribution changes from random to aggregate. The increasing stress leads to the failure mode of sample shifts from shear damage dominated to tensile damage dominant. The additional cyclic increase the number of the shear elements.

Automated summary

Through conducting three different cyclic loadings on marble, it was found that the continuous decreasing correlation dimension and b value can be considered a robust signal of imminent rock failure. Additionally, extra cyclic loadings increase low-energy AE events and cause a change in AE distribution.