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Introduction. The research aims to study concentrating mill tailings dam protecting dike soil consolidation on the example of a mining enterprise of the Kola Peninsula. Research methodology. The research is based on 4D modeling (taking into account a time factor) using PLAXIS software solution. The computer hydro-geomechanical 3D model of the concentrating mill tailings dam fragment has been developed allowing to investigate both geomechanical and fi ltration processes, and their collateral infl uence on protecting dike and alluvial beach soil consolidation. The following options of tailings dam hydro-geomechanical condition development are considered: a reference state at the current parameters of operation, increase in the level of water-saturated tail deposits and the subsequent consolidation of bulk and alluvial soils within 1, 2, 3, 5, 10, 15, 20, 30, 50 and 80 days. Research results and analysis. The received results have been analyzed on the dynamics of the tailings dam hydro-geomechanical condition therefore revealing its behavior in time. It has been established that the nature of bulk and alluvial soils consolidation is identical, however, differs signifi cantly in terms of quantity. Conclusions. Dependences of bulk and alluvial soils consolidation of the tailings dam hydraulic engineering construction on consolidation time are established providing a scientifi c and technical basis for its mechanical state and stability assessment, and for engineering recommendations about the terms of the following stage of dams building.

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