Geotechnical and kinematic parameters affecting the coefficients of restitution for rock fall analysis

► Rockfall experimental study for different rock types. ► Effect of impact angle on the coefficients of restitution. ► Influence of hardness on the coefficients of restitution. ► Correlation between hardness rebound value and kinematic coefficient of restitution. ► Proposal for the estimation of the normal COR relevant to the hardness and impact angle.