Failure mechanism of fractured rock and associated acoustic behaviors under different loading rates

Mechanical and associated temporal-spatial microcracking behaviors of fractured sandstones, a hard and stiff rock, were tested and observed under different uniaxial loading rates with the aid of acoustic emission (AE) monitoring. Based on the principle of microcracking nucleation and multiple locked-patches failure theory borrowed from seismology, some experimental phenomena during crack propagation process, AE generated mechanisms as well as...