Purpose. Substantiation of environmentally acceptable and technically safe operational mining schemes in the context of disturbed hydrogeological and geomechanical conditions by means of developing adapted filtrational model of the mine field.Methods. Numerical mathematical stimulation of geofiltrational processes in heterogeneous in terms of capacitivity and permeability rock massif involving surface-water and underground water dependency, leakage through partitioning poor water-permeable strata, as well as changes in boundary conditions and geofiltrational parameters in the context of time and space. Findings. Hydrodynamic model of the mine field has been identified with the help of imitating technogenic ground water dynamics formed during different periods of mine operation. Its reliability has been confirmed by the results of predicted solutions concerning estimation of inflow values within high-amplitude tectonic disturbance having high level of convergence with actual data while roadheading (up to 95%). The effect of mining operations as well as operation of mine water gathering pond on underground water dynamics of subsurface water-bearing formation which determines both environmental situation and water use, has been numerically estimated.Originality. Regularities of changes in filtrational parameters and capacity parameters in terms of time and space under the conditions of nonstationary geodynamics of rock massif have been specified. Elastic hydrodynamic disturbances with values of compressibility and permeability comparable to undisturbed poor water-permeable rock massif consisting of argillites, aleurites, and arenites have been determined for a zone of tectonic disturbance. Practical implications.The determined rules concerning formation of ground water dynamics of subsurface waterbearing system make it possible to differentiate natural components and technogenic components in the context of disturbance of hydrogeo-chemical composition of ground water used for water supply and specify parameters of water intake. High reliability of predicted solutions has helped substantiate and implement specific hydrogeomonitoring of crossdrift drawing through tectonic fault zone where amplitude is more than 300 m and prevent mine water inflows incidences at minimum costs.
The physicomathematical conjugation of filtration models of a flooded and an adjacent mine is carried out with a justification of methodological principles of analysis and prediction of a technogenic mode of groundwater in conditions of operation and flooding of a mine field. The identity of models and real objects is established as a result of solving a series of inverse problems and is confirmed by a water balance discrepancy of 0.003%, the convergence of water inflows in separate layers with a deviation of 5 – 12.5% and the coincidence of groundwater surface levels on models and data of a mode network. According to results of predictive solutions, it is established that dynamics of flooding of a rock massif within old stopes are more intensive than the restoration of a level of groundwater in a mine shaft. The options of technical solutions for curtailment of mining operations are justified, the ecological risks and costs of which can be optimized by constructing a water intake of technical (or drinking) water in the productive stratum of riverbed sandstones, as well as equipment for geocirculation heat supply systems using the capacitive resource of a flooded mine field.
The paper considers specific character of hydrogeological problems arising during the whole cycle of a mining enterprise operation; the most reliable their solutions are implemented in the context of numerical hydrodynamical models of mine fields. Basic approaches to schematize laminated carbonic formation through simplification of natural rock mass permeability have been substantiated; prediction algorithm of its changes during temporal transformation has been developed. Numerous identification problems solving in the process of modeling mine fields has helped understand that water inflow amount cannot be correlated with the extension of mining area. Within the areas with roof caving, permeability of carbonic formation is a time variable which value increases 10 – 15 times in the context of rock displacement, halves after 5 –10 years and nears natural values after 15 –20 years. In the context of Western Donbas, the modularized schemes have been tested while solving problems concerning filtration control within mine fields and their surface influence areas with high confidence of hydrogeological forecasts.
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