Stress wave propagation and dynamic behavior of red sandstone with single bonded planar joint at various angles

Abstract

Dynamic impact tests were carried out on red sandstone specimens with single bonded planar joint at various angles based on a split Hopkinson pressure bar (SHPB), to investigate the stress wave propagation and fracturing evolution of the specimens comprising two blocks. The results indicate that the bonded joint will reduce the dynamic strength from 3.10% to 32.13% compared with the intact specimen. The larger the joint angle is, the more significant the wave attenuation is. The variation trend of energy absorption rate is similar to the tendency of the dynamic strength, showing a positive correlation between the energy absorption rate and the dynamic strength. Tensile cracks dominate the specimen failure behavior during the dynamic fracturing process by observing the images captured by a high speed camera, leading to the slabbing failure with different degrees of slippage along the joint surface. In addition, it is found that the variation tendency of dynamic strength based on the experimental results is consistent with the theoretical analysis.