Fracture Fractal and Energy Transfer Characteristics of Deep-Mine Marble under an Impact Load

With changes in mining depth, the dynamic mechanical characteristics of same type rock also change, so that blasting excavation process must be constantly adjusted and optimized to meet requirements safe efficient mining. To study energy evolution law fractal deep marble during destruction process, impact tests under different strain rates were carried out on a sample using three-axis combination Hopkinson pressure bar system. The experimental results show larger incident is, more is transmitted. proportion absorbed does not increase with energy. Only 30%–38% by impacted rock. an rate, consumption density gradually increases, fragmentation degree intensified, dimension failure mode from compression–shear crushing failure.