Abstract
When evaluating trajectory of rock blocks in the event of bedrock slope failure, there is an usefull technique called three dimentional distinct element method which models shape and size of rock blocks faithfully. However, jumping height observed in a rock fall model experiment differs considerably depending on how a rock block makes contact with slope surface. This paper covers a rational dynamics model of the contact mechanism taking into account relations between coefficient of restitution and contact area in order to reproduce jumping of a rock block. We applied this idea to the rock fall model experiment and a real field and were able to get a good reproduction result.
