期刊
JOURNAL OF CENTRAL SOUTH UNIVERSITY OF TECHNOLOGY
卷 15, 期 1, 页码 95-99出版社
JOURNAL OF CENTRAL SOUTH UNIV
DOI: 10.1007/s11771-008-0019-6
关键词
rock mechanics; fatigue properties; cyclic loading; fracture evolution; fatigue damage
Fracture evolution process (initiation, propagation and coalescence) of cracked rock was observed and the force-displacement curves of cracked rock were measured under uniaxial cyclic loading. The tested specimens made of sandstone-like modeling material contained three pre-existing intermittent cracks with different geometrical distributions. The experimental results indicate that the fatigue deformation limit corresponding to the maximal cyclic load is equal to that of post-peak locus of static complete force-displacement curve; the fatigue deformation process can be divided into three stages: initial deformation, constant deformation rate and accelerative deformation; the time of fracture initiation, propagation and coalescence corresponds to the change of irreversible deformation.
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