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.
Purpose. Theoretical and technological substantiation of parameters and schemes related to formation and use of natural and man-made volumetric and thermal resources of abandoned coal deposits using complex of geo-modules providing their activation, selection and storage in keeping with uneven seasonal energy consumption. Methods. Analytical and numerical methods for solving equations of hydrogas dynamics and heat-mass transfer; mathematical modeling by means of special software; statistical methods; stabilometrical testing of aqueous rocks samples by triaxial compression tool. Findings.The system of models presenting gas-dynamic, filtration and heat processes occurring in disturbed rocks as a result of natural and man-made resources development while shutting down mining works has been developed. The studied patterns of water and gases movement in low-permeable coal-bearing rocks, reservoir beds and flooded mines allowed to evaluate the technological parameters of extraction, accumulation, and utilization of these heat transfer fluids for heating and cooling of buildings. The paper proposes and justifies technological options serving to utilize the thermal resource of water in a flooded mine and to activate this resource by underground combustion of residual coal reserves.Originality. The mechanism of heat transfer in the flooded rock mass of the abandoned mine with periodic pumping and selection of mine waters from different horizons and their heating by natural geothermal heat and underground combustion of residual coal reserves has been studied.Practical implications. The developed models have been implemented in real mines which allowed to evaluate the ranges of flow and heat transfer parameters related to the conditions for heat transfer fluid extraction and utilization at the final stage of mining. The developed models and obtained dependences allowed to justify the parameters of technological schemata aimed at the development of natural and man-made resources of coal deposits.
Purpose. Substantiation of hydromechanical parameters that make it possible to control the safe ratio of hydrodynamic levels in a mine shaft and a rock mass when closing mines using submersible pumps. Research methodology. An experimental-analytical method was used, which consists in the formation and analysis of data from field tests of fractured porosity, permeability and the position of groundwater levels in hard sandstones around mine shafts with concrete support. Research results. It has been established that the hydromechanical state around a mine shaft in stable water-bearing rocks is characterized by the development of mutually competing processes of nonlinear decrease in the permeability of the loaded rock contour and hydrogeomechanical unloading of structural elements of water-bearing rocks and filter attachment. The values of the hydrogeomechanical unloading of the shaft attachment in the range of 0.054 - 6.125105 Pa are close to the tensile strength limit of the "concrete-water-bearing rock" contact, which indicates the danger of its collapse. Scientific novelty. The problem of combining the elastic viscometric load of the rock mass attachment and the hydrodynamic planar-radial flow to the wellbore is solved, where the hydrogeomechanical state in stable water-bearing rocks is characterized by the development of mutually competing processes of nonlinear decrease in the permeability of the loaded rock contour and hydrostatic unloading of structural elements of the water-bearing rocks and filters. Practical value. The obtained solutions and their analysis explain the discrepancy between the calculated (standard) loads on the fastening, which is known from practical experience, and actually measurable values, and also have significant practical significance. The established fact of the approximation of the value of hydrogeomechanical unloading of the stovol attachment to the tensile strength of the contact "concrete - water-bearing rock" is dubious and requires a decrease in the hydrodynamic deflection to the mine stovol when controlling the process of flooding with submersible pumps.
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