AN EXPERIMENTAL STUDY ON THE DAMAGE AND ACOUSTIC EMISSION CHARACTER OF RAW COAL UNDER UNIAXIAL COMPRESSION CONDITION

In the paper, the acoustic emission character is analyzed using a new damage variable which is defined based on ring-down count or energy count of acoustic emission and the damage model of raw coal under uniaxial compression is thus established. The results show that acoustic emission information can reflect inter-nal damage of raw coal and is closely related with primary crack compression and evolutionary course of new crack generation, growth, and connectivity.