Studies on rock fall problems by three dimensional discontinuous deformation analysis

ABSTRACT: The authors improved the fixed block option for rock fall problems based on three dimensional DDA. The fixed block option is calculate the rock fall models with applying the fixe block option to the base blocks of the mountain modeled the falling blocks. By introducing the assumption, the integration of the complex shape was avoided in each time steps. Hence, the calculation time is ten times faster than using original algorithm and good numerical stability.