Abstract
Publisher Summary This chapter presents short descriptions of universal distinct element code (UDEC) and 3-dimensional distinct element code (3DEC). UDEC is a two-dimensional numerical program based on the distinct-element method for discontinuum modeling. UDEC simulates the response of a discontinuous medium, represented as an assemblage of discrete blocks, subjected to either static or dynamic loading. The discontinuities are treated as boundary conditions between blocks; large displacements along discontinuities and rotations of blocks are allowed. Individual blocks behave as either rigid or deformable material. Deformable blocks are subdivided into a mesh of finite-difference elements, and each element responds according to prescribed linear or non-linear force-displacement relations for movement in both the normal and shear directions. The relative motion of the discontinuities is also governed by linear or non-linear force-displacement relations for movement in both the normal and shear directions.
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