Acoustic emission, damage and cracking evolution of intact coal under compressive loads: Experimental and discrete element modelling

In underground mining engineering, it is of considerable significance to focus on acoustic emission (AE), damage and cracking evolution inside coal. This article first performed a series of triaxial compressive tests on intact coal specimens simultaneously monitored AE signals; then evaluated the cracking behaviours of intact coal specimens under biaxial compression using a two-dimensional particle flow code (PFC2D). Before the specimens enter...