Abstract: A series of uniaxial compression tests under different strain rates on granite samples (74mm) were carried out using split Hopkinson pressure bars (SHPB)， to study the strain-rate effect and the relationship between the degree of damage and energy dissipation of granite. The test results show that the dynamic compression strength of granite has obvious strain rate effect. The energy dissipation per unit volume increases with the increase of strain rate， showing an approximate linear relationship. At the same time， the strain rate also increases with the increase of energy dissipation rate， showing nonlinear relationship. The degree of damage of granite samples has good consistency with the energy dissipation per unit volume， generally with one to one correspondence， but does not have one to one correspondence with the strain rate. There is no contradiction between the degree of damage of granite samples having inconsistence with the strain rate and strength enhancement with the strain rate.

Key words: rock mechanics, SHPB(split Hopkinson pressure bars) test, strain rate effect, energy dissipation, degree of damage