Experimental studies on the strength of different rock types under dynamic compression

A series of dynamic compression tests for rock samples with analogy through mortar at strain rates from 10^-4 to 10¹s^-1 and confining pressures at 0, 2, 10MPa, are reported in the present paper. It is noted that the compressive strengths for the three series samples generally increase with increasing strain rate at different confining pressures and the rising rates have a decreasing tendency with the increasing confining pressure. It is also indicated that the rising rates of the compressive strength with the increasing of confining pressure have the same tendency at different strain rates. It is further suggested that at the same strain rate gap, the absolute increments of strength are almost the same at different confining pressures. Also, the absolute increments of strength between the same confining pressures are almost identical at different strain rates.