The principal state of geodynamics and one of its most important aspects - geodynamics of explosion - are discussed. Mechanical movement of dense media acted on by impulse loads is the principal topic of the study of geodynamics. Since the study of wave processes in dense media are based on the introduction of simplified schematic models of these media, for the purpose of developing general methods of solving wave issues, many such models exist. In particular, there are linear elastic, non-linear elastic, elastic-plastic, elastic-viscous, elastic-viscous-plastic, and many other models differentiated by the type of function or constant values representing their actual properties. It is shown that mechanical behavior of soft land under explosion loads differ fundamentally from the behavior of hart substances. Six components of the stress tensor, density, temperature, and three components of velocity must be found for a non-ideal medium under general circumstances. There were efforts recently to solve this problem by considering land as a multicomponent viscous-plastic medium. G.M. Lahov, I.A. Wuchka, and V A. Pwaksy have solved the issue of propagation of cylindrical explosion waves in land, using a viscous-plastic model with variable viscosity. A finite differential numerical schema of the computations with artificial viscosity was used, developed for elastic-plastic media and extended to few non-linear viscous-plastic media. This model considers the difference of compression and relief equations only in the free space of pores, and for the remaining components these equations are the same. The solution was developed for two types of land: unsaturated sand of average density; and water saturated clay. With consideration of ecological and economic factors, some aspects of the practical application of geodynamics of explosion for technological objectives are shown. It has been shown that in many cases the blasting technology of mining and earth work are currently much more economical and more acceptable acologically, as compared to excavations performed with the use of machines.
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