Study On Failure Characteristics Of Rock Under Of Influences Of Loading Rate

This paper focused on the stability of Rock specimen-test machine system under different loading speed. Based on the analyzing of Rock specimen-test machine system stability of the rate effect, Four groups of loading rate、two kinds of different strength mechanical texts were taken. The results show that with the increase of loading rate, the peak pressure of two kinds of Rock specimen increases, pressure drop increases; but the peak pressure of high strength specimen faster, pressure drop greater; the post peak stage, the loading rate is bigger, the higher the strength of the Rock specimen, the stability of the Rock specimen-test machine system is lower. The feedback characteristic of the Rock specimen-test machine system associated with the feedback characteristic of the Rock specimen subsystem and the stiffness of test machine subsystem. If the stiffness of test machine is large enough, it is able to offset the impact of negative feedback state of the Rock specimen, so the Rock specimen-test machine system is in the state of negative feedback; If the stiffness of test machine is not large enough, it is not able to offset the impact of negative feedback state of the Rock specimen, so the Rock specimen-test machine system is in the state of negative feedback.