Study on the fracture properties of rock subjected to dynamic loading

Dynamic fracture process analyses and dynamic tensile tests based on Hopkinson's effect combined with spalling phenomena were conducted to estimate the fracture prosperities of rock subjected to dynamic loads. Dynamic fracture processes of rock specimens subjected to dynamic loads were analyzed to investigate the strain-rate dependency of dynamic tensile strength and the response of the displacement velocity at the free end of the specimen under different fracture energies. Based on the experimental and numerical results, the diagram for the estimation of the fracture energy G(f) and coefficient of uniformity m for Inada granite was suggested. The estimated fracture energy G(f) and coefficient of uniformity m for Inada granite was 10.5 Pa(.)m and 13.5 respectively. Finally, the possibility of strain-rate dependency prediction of dynamic tensile strength for rock was discussed using the proposed approach.