ABSTRACT
The dynamic loading processes and Dynamic Stress Concentration Factor (DSCF) around a circular hole under transient wave incidence are analyzed based on the wave function method. In addition, a modified Hopkinson pressure bar system with coupled static and dynamic actions is used to study the failure characteristics of a granite specimen with a hole. Different coupled static pre-stress and dynamic loading experiments are conducted. The dynamic failure process and characteristics of the granite specimen with a hole for the test conditions are summarized. The DSCF surrounding the circular cavity under initial static stress coupled with dynamic loading was then quantitatively analyzed, and the effect of dynamic loading with different time and initial pre-stress with different side-pressure coefficients are further simulated based on LS-DYNA. The facility employed in this work provides useful results to investigate the characteristics of underground rock failure.
