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The use of the southern cage shaft of no. 11 mine within the structure of water-drainage system of M. Gorky Mine for water pumping using submersible pumps in order to ensure the safe operation of ground surface objects is substantiated.

The results of studying technogenic seismicity that arose in the area of open pit coal mining in the Novosibirsk region are presented. The mining intensity at the Gorlovskoye coal deposit increased significantly in the last decade and seismic activation of the subsoil of the Gorlovskaya depression is formed in response to the technogenic effect. Earthquakes with a magnitude of 4.5 experienced in Novosibirsk and its suburbs have been recorded in coal deposit area since 2019

A brief assessment of the mining, geological and geomechanical conditions for the development of production horizons of the Central Stocks section of the Kazskoye field is given. The analysis of rock pressure manifestation in a dynamic form is carried out. The stress-strain state of the rock mass has been diagnosed. The measurement results of strain increment level using depth and contour benchmarks are presented and the category of rockburst hazard is determined for different horizons. The stress-strain state of the rock mass was measured with the SB-32M device according to the parameters of acoustic emission. The time criteria for assessing the rockburst hazard were adjusted on the basis of comparing the results of recording the parameters of acoustic emission and the level of stresses obtained from the strain increment results at the stations of deep and contour benchmarks. A project has been developed for the installation of mobile seismic monitoring for recording events in stoping influence zone.

Tests and calculations were carried out, shear characteristics of the dump mass were estimated, taking into account several variants of landslide formation. The research results allowing to optimize the design parameters of external dump formation with a significant economic benefit are presented.

In this paper, the range of angles of the velocity vector of incoming air flow relative to the cross-sectional axis of ventilation connection between tunnels is determined by computational methods. Based on the data obtained, recommendations are given for the most rational dimensions, spatial location and installation angle of dust filter panels in the ventilation connection between tunnels.

In this paper, an approach to create reversible mine axial fan with inlet guide vanes is considered. In this approach, the guide vanes rotate and operate as an impeller in the reverse mode, while the impeller slows down and works as guide vanes. To increase the operating efficiency in the reverse mode, the blades of the impeller and inlet guide vanes are turned at certain angles not exceeding 65°. To determine the turning angles of blades in the reverse mode, theoretical dependences were used, according to which the angles of flow rotation in flat gratings composed of blade profiles were calculated at the middle radius. The range of turning angles of the blades for the reverse mode is determined for fan configurations with a hub tip ratio of 0.6 at different flow and theoretical pressure coefficients. The characteristic in the reverse mode is numerically determined by the example of one fan.

The relevance of studying short-period rock displacements and estimating the stress-strain state of the rock mass in rockburst-hazardous deposits is shown. The observation procedure using satellite geodesy methods is set forth. The results of continuous hours-long monitoring the shear of the Earth’s surface at the Tashtagol deposit for the period of 2006 - 2020 are presented. The features of the development of short-period displacements during seismic activity manifestation of the rock mass in the deposit area are revealed. The dependence of the energy of seismic events on the velocities of short-period displacements is determined. This observation method is prospective in geodynamic test sites to assess the seismic activity of deposits.

The paper presents the results of computational modeling of evaporative cooling of tunnel air during the phase transition of water from a liquid to a gaseous state in subway tunnel conditions at various parameters of spraying equipment. It is shown that this method significantly reduces the requirements for ventilation equipment in comparison with the method of removing heat excesses by ventilation alone. To remove heat excesses by ventilation alone, the capacity of one fan (with two fans running in parallel) is up to 269 m³/s, and the power is 727 kW. When using evaporative air cooling, the maximum capacity of one fan is 67.5 m³/s with a power of 104 kW, the pump power does not exceed 50 kW with a maximum water flow rate of 1.5 m³/h.

The idea of selecting and justifying the technology options based on a rating approach to the analysis of determining factors for the safety and efficiency of mining operations is considered with regard to the class of mining systems with caving of ore and enclosing rocks. A formalized method of the scoring system has been developed, which makes it possible to quickly make decisions regarding the use of geotechnologies based on the predicted stability of mine workings, the amount of losses and dilution of ore, taking into account the value of recovered minerals. The domain of rational influence of sublevel and block caving in different mining, geological and geomechanical conditions has been determined.

The results of studying aerodynamic processes taking place in extended blind drifts are presented. The change in local aerodynamic resistance of area under study is shown at the supply and suction modes of mine ventilation. Based on the results of computational modeling, it is shown that sepa-rately installed longitudinal partitions allow ventilating blind drifts (up to 100 m) without using lo-cal mechanical ventilation due to the resulting ejection effect.