Numerical simulation of flaw inclination effects on rock-like specimen behavior using UDEC

Abstract

This study investigates the influence of flaw inclination angles on the mechanical response of rock-like specimens with pre-existing flaws under dynamic loading conditions, employing the Discrete Element Method (DEM) software UDEC. Several Split Hopkinson Pressure Bar (SHPB) compression tests were previously conducted on these specimens, each containing a single non-persistent flaw. The study considered two flaw orientations and a single flaw. Earlier experimental investigations revealed that specimens with unfilled flaws exhibited the highest dependency on flaw inclination angle. Notably, the weakest mechanical response for flawed specimens was observed at a 30° flaw orientation, aligning with the shear failure plane of intact specimens. UDEC numerical simulations were performed to further elucidate the experimental findings. The peak stress response of flaw models obtained were less than intact rock models, which matched well with the experimental results. These simulations provided invaluable insights into the dynamic behaviour of rock-like specimens. © 2024 The Author(s).