Anisotropic dynamic fracture and energy dissipation characteristics of
interbedded marble subjected to multi-level uniaxial compressive cyclic
loading
Abstract
This work aims to investigate the anisotropic fracture and energy
dissipation characteristics of marbles cored along an angle of 0°, 30°,
60° and 90° with respect to interbed planes, subjected to multi-level
cyclic loading conditions. Rock fatigue deformation, strength, lifetime
and dissipated energy first decreases and then increases with increasing
interbed orientation, they get to the minimum for sample having 30°
interbed orientation. Rock stiffness degradation is significant with the
increase of cyclic level and the stiffness evolution is affected by
interbed structure. The incremental rate of dissipated energy becomes
faster with increase of cyclic loading level and it presents an abrupt
increasing trend at the last cyclic loading level. A damage evolution
model was first established based on the dissipated energy to describe
the two-phase damage accumulation characteristics. It suggests that the
proposed model fits well to the testing data and favorably represents
the non-linear characteristics of damage accumulation.