Damage Characterization of Marble Under Cyclic Impact Loading
In order to study the damage change characteristics of marble under local cyclic impact,the paper uses the damage factor to define the damage degree of the rock.Then with the help of the pendulum impact testing machine on the marble specimen with different impact energy under the contact area ratio of 1/18S cyclic impact test,the study analyzes the impact damage to the marble specimen with different impact energy and the number of impacts,and the change characteristics of the damage factor caused by different impact energy and the number of impacts.The results shows:when the pendulum lifting angle is 10°,the specimen does not have obvious damage;with the increase of the number of cyclic impact,the damage factor increases;when the cyclic impact increases to a certain number of times,the specimen is macroscopically damaged,and the damage factor changes significantly;with the increase of the pendulum lifting angle,the wave speed begins to decrease significantly,the impact absorbed energy and the number of impacts required during the specimen fracture damage also decreases,and the growth rate of damage factor reaches 75%.Considering that the impact mode of the rock on the shaft walls is localized impact with different contact areas,these results can provide a new idea for the study of the impact damage of rock to the shaft walls in mines.
marblelocalized cyclic shockpendulum testdamage factorabsorbed energy
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