Abstract
In the DDA (Discontinuous Deformation Analysis), the ratio of velocity energies (squared velocity ratio) is used for the energy loss during collision. The velocity ratio is investigated in detail with the experiments. It was clear that the velocity ratio is dependent on the incident velocity of the normal direction. Therefore, velocity ratio is not appropriate to consider the property as a direct input value of the simulation. However, we have clarified that it is possible to perform a rockfall simulation by considering the velocity-dependence of the velocity ratio in the application of DDA by using the “Scale Factor” as proposed by Pfeiffer et al. (1989).
