Discontinuous Deformation Analysis (DDA) is a numerical method, similar to the finite element method, for solving stress-displacement problems, but for a jointed rock mass. DDA uses an implicit algorithm for simultaneous solution of the equations of equilibrium by minimizing the total potential energy of the blocky rock mass system. The relation between adjacent blocks is governed by equations of contact interpenetration and accounts for friction. DDA adopts a stepwise approach to solve for the large displacements that accompany discontinuous movements between blocks. The blocks are said to be "simply deformable". Since the method accounts for the inertial forces of the blocks' mass, it can be used to solve the full dynamic problem of block motion.
DOWNLOAD :
http://prdownloads.sourceforge.net/dda/InstallDDA.zip?downloadofficial sites :
http://dda.sourceforge.net
أكثر...