Dynamic Compressive Mechanical Property Characteristics and Fractal Dimension Applications of Coal-Bearing Mudstone at Real-Time Temperatures

Coal-bearing rocks are inevitably exposed to high temperatures and impacts (rapid dynamic load action) during deep-earth resource extraction, necessitating the study of their mechanical properties under such conditions. This paper reports on compression tests conducted coal-bearing mudstone specimens at real-time (the temperature rock remains constant throughout impact process) ranging from 25 °C 400 using a Hopkinson (T-SHPB) test apparatus developed in-house. The objective is analyze relationship between fractal dimension fractured fragments explore response combined effects macroscopic fracture characteristics. found that peak stress elastic modulus initially increased then decreased with increasing temperature, in 25–150 range monotonically decreasing 150–400 range. Based distribution coefficients dimensions fragments, it was degree damage shows trend an initial decrease increase temperature. In °C, expansion clay minerals within filled voids skeletal particles, resulting densification damage. thermal stresses internal fractures reduced overall strength mudstone, Negative correlations dimensions, elasticity, could be used predict engineering.