Experimental and numerical study of coal-rock bimaterial composite bodies under triaxial compression

Abstract To accurately predict coal burst hazards and estimate the failure of pillars in underground mining systems, it is great significance to understand mechanical behavior coal-rock bimaterial composite structures. This paper presents experimental numerical investigations on response rock-coal, coal-rock, rock-coal-rock structures under triaxial compression. The compression experiments are conducted confining pressures range 0–20 MPa. resulting inside fracture networks detected using X-ray-based computed tomography (CT). experimentally observed data indicate that parameters composites superior those rock-coal combinations. After failure, combination specimens analyzed via X-ray CT. results display bodies primarily takes place within coal. Further, bursting proneness reduced by increasing pressure. Subsequently, corresponding simulations carried out particle flow code. reveal vulnerable with regard energy storage accumulation.