Purpose. Substantiating of contiguous coal seams coefficient during application of borehole underground coal gasification technology based on dependences of interstratial rocks subsidence on gasification duration. Methodology. Using stand experimental research and methods of computer modeling we obtained the dependences of interstratial rocks subsidence in terms of their thickness change, alternating thickness of coal seams and duration of the gasification process. To reflect the geomechanical situation of rock mass around underground gasifier, license software Flac 5.00 was used. For data processing and building of synthesis dependences, the method of multiple regression using generally accepted data processing systems - Excel-2013 was used. Findings. The obtained inequality allows setting the coefficient of contiguous coal seams during the application of underground gasification technology. Setting this factor makes it possible to assess mining and geo-logical conditions of coal seams occurrence with further rational order of their gasification. For values of contiguous coefficient 5,5 - 5,7, gasification of coal seams can be carried out both in ascending and descending sequence. In this case, there is no need to preserve the allowable distance between combustion faces on adjacent seams. Originality. To determine the contiguous of coal seams, a mathematical mechanism was developed, whose effectiveness is confirmed by computer simulation of rock massif that contains an underground gasifier and by research on a special test bench installation. The difference between the results was less than 24 %. Practical value. Dependence of interstratial rocks subsidence at changing duration of the gasification process describing the development of possible formation of gas-permeable cracks in interstratial rocks ensuring technological process was established. The obtained conditions of contiguous coal seams allow providing rational orderof mine workings.

Purpose. To substantiate principles of rock pressure usage during underground mining of deposits. Methodology. Zonal structuring indices of massif around mine workings were established with help of industrial, laboratory and theoretical research of stress-strain state of rock massif. Research on entropy influence on energy exchange and deformations developments in undisturbed rock massif is conducted by means of the entropy method. Research on preventive capsule formation processes around mine workings and forms of energy transition into work of rock deformation is executed with help of the energy method. Development of geo-energy approaches for the choice of development workings pathways and calculation of their bolting parameters as well as substantiation of parameters of conducting stoping operations in energy zones of preventive capsules is executed according to the estimation of geo-energy technology effectiveness and realization of industrial implementation during underground mining of deposits. Findings. Physical essence of zonal capsulation phenomenon of mine workings is revealed. Geo-energy principles of rock pressure energy usage are substantaited. Resource-saving technologies of mining of mineral depositis are created and implemented into production. Originality. The paper deals with systematization of the picture of phenomena, capsulation processes and regularities by massif of mine workings with determination of shape, sizes, quantity of energy zones, sinusoidal-damping stresses and ring modules of deformation by means of complex account of geo-energy factors that allow using energy of rock pressure in underground mining technologies systematically. Practical value. The energy prediction theory of zonal capsulation parameters research of mine workings is developed which allows studying shapes, sizes, quantity and conditions of formation of energy zones and borders of possible destruction of the massif. Power dependences are established as to changing the sizes of adjacent power zones whose ratio is a constant from the sizes and shape, depth of laying and physical properties of massif containing mine working. The thermodynamic theory of massif that is not disturbed by workings is improved by means of considering the processes of geo-energy streams redistribution and entropy exchanging with allocation into undisturbed massif in a separate entropy method of research. Further development of the sinusoidal-fading dependence of auto-wave fluctuations of stresses in massif that broken by mine workings from gradients of density, temperature, gas-and water saturations of rocks is given.

Purpose. To substantiate parameters of zeolite-smectite puff-stone deposit hydromining method while analyzing dependences between physico-technological indices of hydromining equipment and rock mass characteristics, which will help optimize the extraction technique. Methodology. Complex research approach (i.e. field observations, laboratory tests, and bench testing) is the methodological basis to solve the problem. The approach involves system analysis, physical modeling of hydrodynamic processes, and outcome analysis using MаtLаb mathematical software package. Findings. Dependences of zeolite-smectite puff-stone failure upon a mouthpiece diameter, water pressure, washout radius, and gravity streaming hydraulic transportation within an extraction chamber have been determined. Effect of kinetic energy of a falling slurry stream on the decrease in the specific power consumption in the process of rock transportation over an extraction chamber floor has been identified. Power consumption dependence upon hydraulic monitor dimensions and working agent pressure is of quadratic nature: the increased pressure of a working agent in front of a mouthpiece, power consumption of the washout increases, and specific water consumption drops. Originality. For the first time, an approach to describe zeolite-smectite puff-stone failure taking into consideration hydrodynamic puff-stone washout, hydraulic mixture migration within an extraction chamber, and transportation of the mineral has been applied. Relying upon power consumption to washout hydraulic mixture and transport it within a washout chamber, both linear nature and directly-proportional dependence of transport capacity upon hydraulic monitor loss and chamber floor slope has been determined. Power consumption dependence has been defined for different types of mouthpieces and working agent pressure in order to avoid cuts and layer-by-layer washout of a mineral. Practical value. The obtained results can be applied to improve dominating parameters influencing the hydrodynamic process for zeolite-smectite puff-stone washout. For the purpose, rational efficiency of puff-stone failure has been identified as well as rotational angle of a lateral mouthpiece of a jet head at 15 - 20 m height in terms of layer-by-layer washout with rock migration over a distance being equal to a half of the washout diameter. Real conditions (for zeolite-smectite puff-stones) have been determined under which minor jet velocity variation from the determined parameters results in a cut or in a fall of the washout chamber.

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