Abstract
Discontinuous Deformation Analysis (DDA) was developed by G. H. Shi and RE. Goodman. It solves a finite element type of mesh where all the elements are isolated blocks and bounded by pre-existing discontinuity under kinematic conditions of dynamic and quasi-static motion. The authors developed elastic-plastic yield criteria of Drucker-Prager associated constitutive laws, rock-bolt and connected element and improved penalty method for block penetration. The developed methods are applied for the stability of rock slopes, tunnels and underground openings with different joint sets models and rock blocks test models. Since, these methods are applicable for the discontinuous rock mass models under many analytical conditions in theoritical and the results show validity for practical use.
