Experimental study on the fatigue property of fractured rock-like materials under cyclic loading

摘要

The uniaxial compression constant amplitude fatigue test was adopted to make cyclic loading tests for pre-fractured 30°,45°,60°and 90°rock-like model specimens and the corresponding anchored model specimens.It was indicated that the processes of fatigue damage of fractured rock-like specimens can be divided into three stages:fatigue crack initiation stage,fatigue crack propagation stage and fatigue crack rapid propagation stage.Compared with non-anchored model specimen,the plasticity of anchored model specimen was significantly enhanced,and anchored model specimen can bear greater axial strain.The anti-pulling force test analysis was made for the fatigue damage process of anchored model specimen in three stages.During the first and second stages of fatigue damage process,the anchorage body was relaxed,but the integrity of model specimen was intact; in the anterior 80％ life cycle of model specimen,the anti-pulling force of anchor was decreased by 20％.