Abstract
In order to study the mechanical characteristics of rock under dynamic load, shock and P-wave velocities were measured by split Hopkinson (SHPB) testing system and NM-4b non-metallic ultrasonic testing analyser. In the test, the specimens were subjected to single impact with different air pressure and cyclic impact with the same air pressure. Acoustic velocity was measured before and after impact to observe the morphological characteristics of rock samples after impact. The results show that: under different air pressure, the rock fracture morphology is closely related to the air pressure. The higher the air pressure, the greater the peak strength of the sample, the more concentrated the damage range to the center of the sample; The results show that the peak stress decreases, the cumulative damage increases and the wave velocity decreases with the increase of cyclic impact times.
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