中国矿山工程

In order to research the energy dissipation law and damage morphology characteristics of granite with different burial depths under low-temperature freezing and expansion conditions under impact dynamic loading. SHPB test system was used to carry out impact dynamic load test on granite with different burial depths at 0, -10 and -20℃, and the effects of temperature and burial depth on energy dissipation and damage morphology of rock were analyzed. The results show that: with the decrease of temperature, the dissipated energy and absorbed energy per unit volume of granite specimens show a tendency of increasing and then decreasing, and the dissipated energy and absorbed energy per unit volume of granite show a tendency of decreasing and then increasing with the increase of burying depth; and the crushing degree of rock shows a tendency of decreasing and then increasing with the decrease of temperature.