CHINA MINE ENGINEERING

To investigate the dynamic tensile mechanical response characteristics of sandstone under impact load, the ? A 50mm split Hopkinson compression rod system was used to conduct dynamic Brazilian splitting disk experiments on sandstone. The research results indicate that the dynamic tensile strength of sandstone under impact load increases with the increase of loading rate, in a quadratic function relationship, and the peak strain of sandstone is negatively correlated with loading rate; In the process of dynamic tensile failure of sandstone, the fragmentation dissipation includes three stages: plastic energy storage stage, plastic deformation energy storage stage, and failure stability stage. Among them, the incident energy, reflected energy, and transmitted energy all increase with the increase of loading rate, showing a linear function relationship (R²≥0.84), and the energy consumption rate shows a quadratic function relationship (R²=0.98). The research results provide reference for the control of coal mine surrounding rocks.