Comprehensive assessment the conditionsof Ladyzhynska TPP hydrotechnical constructions inaccordancewith theirreconstruction

Purpose. The purpose of study is a predictive assessment of stress-strain state of the "DTEK Ladyzhynska TPP" ash dump and changes in the hydrodynamic and hydrogeochemical modes within its location area in conditions of the designed reconstruction. The methodology. Comprehensive assessment of changes in hydrodynamic and hydrogeochemical modes around the ash dump site and defining the hydrogeomechanical stability of enclosing dams is performed based on the results of numerical modeling of groundwater flow and transport, and stress-strain state using the MODFLOW, PHASE2, and GEOSTUDIO software. Findings. The forecast of changes in hydrodynamic and hydrogeochemical modes around the ash dump site in accordance with the accepted ash dump reconstruction scheme is carried out based on the identified regularities of their formation. An assessment of the hydrogeomechanical stability of the enclosing dams in conditions of designed building up the third storey of the ash dump was performed based on the results of numerical simulation of the stress-strain state. Measures to increase the stability of the ash dump's enclosing dams under reconstruction are justified. The originality. New data were obtained regarding the nature of changes in hydrodynamic and hydrogeochemical modes around the ash dump under the conditions of its reconstruction. Measures to ensure stability of the hydrotechnical construction are substantiated in consequence of a comprehensive study of the stress-strain state of the material making up the enclosing dams, considering the predicted moisturizing of dam massif and the seismicity of the territory. Practical implications. The results of the performed research form the basis for substantiating technical decisions regarding ensuring the stability of hydrotechnical constructions of energy-generating enterprises.