Wave reflections at model boundaries are minimized by specifying either quiet (viscous) or free-field boundary conditions. UDEC models a region of jointed material subjected to external and/or internal dynamic loading by applying a dynamic input boundary condition either at the model boundary or to internal blocks. The dynamic facility expands UDEC’s analytic capability to a wide range of dynamic problems in disciplines such as earthquake engineering, seismology and mine rock bursts. The dynamic model likewise can be coupled to the optional thermal model in order to calculate the combined effect of thermal and dynamic loading. This permits, for example, analyzes of the effect of dynamic loading of saturated joints. The dynamic feature can also be coupled to the model for fluid flow in joints. The dynamic formulation can be coupled to the structural element model, thus permitting analysis of rock-structure interaction brought about by ground shaking. The calculation is based on the explicit finite-difference scheme to solve the full equations of motion using real rigid-block masses, or lumped gridpoint masses derived from the real density of surrounding zones (rather than scaled masses used for static solution). Dynamic analysis in UDEC permits two-dimensional, plane-strain or plane-stress, fully dynamic analysis.
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