Purpose. Rationale for sustainable development of fuel and energy resources in Ukraine for the period up to 2030 taking into account improvement of public rental policy, balanced growth of GDP, stimulation of technical and technological innovations, rise of energy efficiency in industry and social sphere. Methods. Methodological basis of research is the methodology of institutional economic theory, analysis of indicators related to the development of energy strategy and mineral resource base of Ukraine for the period up to 2030, analysis of annual balances of fossil fuels reserves and institutional equilibria of social and economic development of Ukraine. Findings. The modern state of systemic problems related to the development of fuel and energy complex of Ukraine has been analysed. Scientifically grounded conceptual propositions of mining rent taxation while mining fuel and energy resources have been developed. Priority areas of improving the mineral resource base of fossil fuels and sustainable development model of the local production of oil, natural gas and fossil coal for the period up to 2030 have been justified. Originality. Development of scientific and methodological provisions of rental relationships related to the production of fuel and energy resources, and the rationale for their sustainable development during the period up to 2030 taking into account the institutional peculiarities of Ukraine. Practical implications. The obtained results will allow to significantly adapt and supplement “The National program of the development of mineral-raw materials base in Ukraine for the period up to 2030” and “Energy strategy of Ukraine up to 2030”, to fully substantiate the prospects of reforming rental relationships and taxation of mining rents in Ukraine as well as establish in the sphere of geology and mineral resources an effective system of reproducing technologically accessible and profitable reserves of fossil coal and hydrocarbons in order to increase their production in order to ensure the viability of all industries and social sphere.

Purpose. Working out measures providing safe application of a shock blasting mode while driving workings in outburst-prone coal seams. Methods. Conveying of shock blasting at the mine workings on the coal mines of Ukraine is regulated by a number of specification documents. At the same time, in the process of shock blasting production numerous technological violations of the mode take place and there are often gas-dynamic phenomena, including those with death of people. The mode of shock blasting at mines is used for unworked coal breaking on outburst-prone seams regardless of results of prognosis and efficiency of antilanding measures done, at troublesome seams in the zones where the reading “prone” is set by latest estimate; and while driving in outburst-prone coal seams. Findings. Shock blasting is used at mines at mines in rather wide range of mining and geological conditions. It is recommended to apply the methods of intensity and frequency of gas and oil emissions attenuation at shock blasting on especially outburst-prone layers. The methods of depth increase of pre-face part of a coal bed unloading zone are used. The increase is achieved by means of heading rock loosening of adjacent strata, advanced blasting, blast hole charge operation in adjacent strata, front-rank loosening (camouflet blasting) of coal bed. Moreover, the blasting pattern with formation of piled blocking retaining wall is applied. Originality. The main scientific and technical principles of the safe and efficient use of a shock blasting mode in blast hole drilling driving in outburst-prone coal seams and beds are formulated. Practical implications. Applying shock blasting mode in mine workings conveying proved to be one of the safest methods to prevent gas-dynamic phenomena. Simultaneously, as a rule, this method is one of the most cost-inefficient methods especially when paced work of coalmine is vital. Therefore, basic research directions are to be continued towards reduction of expenses and increase of this method application efficiency.

Purpose. Rationale for structural and technological parameters of the device for processing the bore hole vuggy zone departing from the set dependences of active jets formation while streamlining the blade element. Methods. Laboratory and theoretical research allowed to establish the regularities of active jets formation while streamlining the blade element of the special device and their influence on the technological indexes of the process of bore holes plugging. Findings. The necessity to conduct pilot research of the device for the interval cleaning of bore hole is well-proven with the purpose to obtain an adequate physical model of its work. The actual types of liquid flowing through the blade system and its interaction with slime vuggy agglomerates have been identified. The terms ensuring stable mode of streamlining the device working unit are considered. The research resulted in determining certain technologically reasonable geometrical characterictics, which provide acceptable modes of processing vuggy zones. Areas of further research are outlined. Originality. A reliability of work of device for processing bore hole index is an observance in his construction of fully certain geometrical correlations, corresponding to the steady mode of moving away of vuggy agglomerates. Practical implications. The results obtained by theoretical and laboratory research can be applied for developing effective technology of fixing and plugging the bore holes with high technical and economic indexes. Data on the study of the mode of streamlining the blade element form the basis for the development of rational mode parameters of cleaning vuggy zones of a bore hole.

Purpose. To develop the methodology for selecting appropriate type of open-pit transport in conditions of mining sinking to the maximum depth of opencast mining. Methods. Comprise determining costs for maintenance of open-pit transport in different combinations of in-pit and main line together with dumping stations of the relevant construction for small, middle and large extension pits. Findings. The proposed optimization of dumping stations placement with combined operation of automobile and railway vehicles allows to exclude utilization of dumping excavators. The efficiency of dumping stations building of block structures is confirmed which allows to decrease total number of dump trucks by 20 – 30% for the average rock transportation distance of about 1.5 – 2 km. The arrangement of dumping stations in the goaf on barrow benches with their further exploitation proves the possibility of effective mining of inclined and upridging deposits. Originality consists in determination of the application field for various types of open-pit transport in changing working area parameters. They are related to sinking of mining, mining intensity and formation of goaf for mining waste storage. Practical implications. The research results allow to develop recommendations for using economical types of transport in accordance with the established open-pit mining mode.

Purpose. Deriving the criterion of a crack (joint) initiating under simultaneous effect of the rock stress state and elastic oscillations generated by an external source is the research purpose. Determining the quantitative relations to estimate the contribution of oscillations to crack initiation and creating a theoretical basis for the improvement of rock burst forecasting technique is a goal as well. Methods. The brittle failure theory and a time-space approach are applied to determine a critical length of initiating cracks depending on stress level and amplitude-frequency characteristics of acoustic oscillations. Analysis of experimental data and comparison with the numerical results are carried out. Findings. Quantitative ratios between the critical length of the crack, the stress intensity factor, oscillation amplitude and frequency are determined. It is shown that there are such values of the oscillation frequencies at which the critical crack length is especially sensitive to the amplitude alteration. The increase in the oscillation amplitude initiates starting the crack with small length. Numerical estimation is made for close-grained sandstone using such characteristics as crack resistance factor and Rayleigh’ wave velocity and tensile strength. Increasing the amplitude twice at the frequency of 1145 Hz causes the triple reduction of the starting crack length. Numerical results correlate with in situ data related to acoustic predicting the dynamic phenomena in the rock mass. Originality. The crack initiation criterion has been identified. Practical implications. Quantitative relations between stress components and amplitude-frequency characteristics should be used to improve the outburst forecasting technique and increase the reliability of dynamic effect prediction.

Purpose. The main purpose of the work is estimating and predicting ecological state of the atmosphere air on the territory of iron-ore mine. Methods. Laboratory research and biological estimation of the atmosphere state in the area of mine location were executed with the help of physical-chemical analysis and biological testing. Standard technique for calculating harmful substances concentrations in the atmosphere air has been used for identifying specifics of dissipation of ecologically hazardous substances in the atmosphere from the ventilation shaft of iron-ore mine. Findings. As a result of the executed research into ecological condition of the atmosphere air in the vicinity of the iron-ore mine located within the city, we have revealed regularities of ground level concentration changes of ecologically hazardous substances depending on the distance to emission source. It is discovered that the conditional index of bioindicators damageability changes with increase of distance from the mine ventilation shaft. It is determined how the conditional index of bioindicators damageability relates to hazard index which helps to determine bioindicators damage levels at different distances from emission sources, both during the usage of trotyl-based and emulsion explosives. Originality. Consists in establishing dependence of ground level concentrations of ecologically hazardous substances influence on the levels of bioindicators damageability at cellular and organismal levels, which will allow to estimate ecological condition of the atmosphere air on the territories adjacent to the mine. Practical implications. Regularities of ground level concentrations of hazardous substances impact on the condition of indicating systems at various levels of their organization are established. It allows to estimate the state of environment and to increase reliability of local environmental monitoring in the area of iron-ore mine location.

Purpose. Comprehensive assessment of the fill slope stability for cyclical-and-continuous technology (CCT) conveyors applied to rocks of stripping at Pervomaiskiy quarry of PJSC “Severnyi GOK” to justify effective anti-landslide measures. Methods. To study geomechanical stability of fill-up rock mass and slopes of the CCT line, the following methods are used: hydrogeological analysis, visual observation of the object, numerical modeling of the fill slope stability in the finite element analysis software Phase2. Findings. Calculations of the fill slope stability for the open belt conveyor gallery, the bases of the embankment mass and pit wall slopes show that the fill-up mass stability is conditioned by the complex effect of geological, hydrogeological and anthropogenic factors. The geometrical parameters of CCT facilities and physical-mechanical properties of the embankment rocks play a key role in ensuring the stable operation of the CCT line and its sustainability. The numerical modeling of different options to strengthen the slopes of the fill-up mass is carried out, the most effective techniques for these purposes turned out to be surcharges, different in geometry, and retaining prisms of rocks. Originality. The stability margins (SM) for the fill-up mass and slopes on cross-section profiles considering physical and mechanical properties of the complex-structured fill-up mass, its water content and loads of mining equipment are calculated. The areas most subjected to geomechanical deformations and displacements are identified. Practical implications. Based on the simulation results, anti-landslide measures are developed to ensure the stable operation of the CCT complex and stability of the embankment slopes and the pit walls.

Purpose. Detecting unstable areas in the filling mass taking into account configuration of the adjacent mineable chambers to improve its formation. Methods. The research into stress state of multi-modulus mass consisting of ore, rocks and filling was conducted using SolidWorks 2011 software with the full compliance of their physical and mechanical properties. Findings. Computer simulation allowed to reveal unstable areas in the filling mass of the first stage chamber under the influence of the development of the second stage chamber. It was found that the vertical stress component forms an area of compressive stresses in the filling mass of the first stage chamber at the junction of its exposure to the roof of filling chamber with dimensions: depth of the mass – up to 50 m, vertical outcrop – 9.8 m, the maximum value of stress reaching 89 MPa. The horizontal stress component also forms an area of tensile stress, but with a lower value of 65 MPa. The horizontal stress component generates in the filling mass of the first stage chambers the area of tensile stresses on the substage level 775 – 810 m with dimensions: depth of the mass – up to 7 m, vertical exposure – 10 m, and the maximum stress value – up to 4 MPa. Originality. Analytical assessment of the filling mass stability allowed to conclude that: at the junction of its exposure to the roof of filling chamber, the compressive stress exceeds the strength of filling mass 1.8 times, in the center of filling mass on the outcrop, the tensile stress exceeds the strength of filling 1.3 times. Vertical stresses exceed horizontal stresses 1.35 times in the areas of filling destruction. Practical implications. The obtained findings related to the stress state of the filling mass can be used in issuing passports for stopes in choosing the filling mode and composition of the filling mixture.

Purpose. To examine rock mass stress changes in hanging wall and footwall rocks of the deposit during mining of primary and secondary stoping chambers. Methods. Analytical research into stress-strain state around stoping chambers was executed with the help of thermodynamical method that gives the highest convergence of calculated elastic deformations and those measured in the mine. Findings. Regularities of stress field formations in the mass of stoping chambers unloading zones are specified. The main areas of stresses concentration located in hanging wall and footwall rocks, in ore mass and backfilling are determined. The shape of radial stress isolines around stoping chambers tends towards ellipsoid. The stress level of mass around hanging wall and footwall rocks, in unloading zones of stoping chambers changes according to exponential dependences relating to the distance from ore deposit. Originality. Consists in capitalizing on the rock mass weakening effect which hosts primary and secondary stoping chambers for using rock stress value for determination of development workings site. Practical implications. The stress level of rocks around stoping chambers is defined and empirical dependencies of radial stresses values alterations in terms of changes of mining depth and proximity from ore deposit contour are specified.

Purpose. Investigating conditions of conducting and maintaining excavation works during mining of seam . Evaluating probability of parting rocks stability loss in terms of top-down mining of two contiguous seams in a series. Methods. Carrying out computational experiments by finite elements method for investigation of the stress-strain state of lithological varieties of parting which is overworked and underworked by stoping on seams and . Findings. The paper presents the results of the analysis of the vertical and horizontal stress components distribution zones along all the height of the parting for the rock types compiling it, treating separately the impact produced by stoping on seams and on the formation of the stress-strain state. Originality. The research substantiates the possibility of disturbed rocks sections interlocking and formation of a single zone of softening along the thickness of parting during combined (with a certain displacement in the seam plane) top-down stoping on the series of seams and , which are not referred to as “adjacent seams” according to the normative documents. Practical implications. The paper describes the possibility of the significant interrelation of contiguous seams during their simultaneous top-down stoping even if they are not related to the category of “adjacent seams”. Therefore, in severe mining and geological conditions, it is recommended to estimate the probability of rocks softening along all the height of the parting.