Energy Evolution Analysis of Coal Fracture Damage Process Based on Digital Image Processing

Coal rocks often contain calcite, which has a significant effect on the mechanical properties of coal and energy evolution during rupture damage. In this study, meso-scale rock is considered, spatial distribution internal structure characterized by digital image technology. Uniaxial compression tests were conducted using RFPA containing calcite veins with diverse dip angles. The research results show that different azimuth angles change stress coal, resulting in higher compressive strength at low (0°, 15° 30°). Under high (45°, 60°, 75° 90°), lower strength. fracture mode significantly affected calcite. At angle, complex, are inclined Z-type (0°), V-type (15°) inverted (30°), respectively. single, type I failure mode. destruction process influenced veins. relatively uniform, weak cementation between matrix vein not easy to be damaged, required for large input energy, accumulated elastic impact index large. uneven, cementitious material damaged small.