ABSTRACT
We developed an impact-loading experimental device to study the dynamic mechanical characteristics of gas-containing coal. The gas pressure state of the specimen was measured and remained constant during impact loading using the gas-sealing device. Axial static pressure was facilitated by using axial oil cylinders, and the axial impact loading on the specimen was attained with the split Hopkinson bar. By using the experimental device, we carried out tests on the stress-strain relation of gas-containing coal subjected to couple static and dynamic loads under different gas pressures. Findings exhibited the general law of stress-strain curves and dynamic strength influence of gas pressure. On the basis of experiment results, gas pressure affected the dynamic mechanical performance of gas-containing coal. The dynamic strength of gas-containing coal decreased with the increase of gas pressure. These conclusions validate the functional accuracy and reliability of the testing using the device.
