The reasons for the lag of the indicators of the leading Russian coal mines engaged in the longwall mining of the flat-lying coal seams from similar foreign mines are considered. The analysis of the efficiency of the longwall face move operations at the JSC SUEK-Kuzbass mines was carried out. A significant excess of the planned deadlines for the longwall face move during the thick flat-lying seams mining, the reasons for the low efficiency of disassembling operations and the main directions for improving the technology of disassembling operations are revealed. The directions of ensuring the operational condition of the recovery room formed by the longwall face are considered. The recommended scheme of converged coal seams mining and a three-dimensional model of a rock mass to justify its parameters are presented. Numerical studies using the finite element method are performed. The results of modeling the stress-strain state of a rock mass in the vicinity of a recovery room formed under conditions of increased stresses from the boundary part of a previously mined overlying seam are shown. The main factors determining the possibility of ensuring the operational condition of the recovery rooms are established. It is shown that it is necessary to take into account the influence of the increased stresses zone when choosing timbering standards and organizing disassembling operations at a interbed thickness of 60 m or less. A sufficient distance from the gob of above- or undermined seams was determined to ensure the operational condition of the recovery room of 50 m, for the set-up room – 30 m. Recommendations are given for improving technology and organization of the longwall face move operations at the mines applied longwall mining of flat-lying coal seams with the formation of a recovery room by the longwall face.
The analysis of a current state of a problem of effective and safe working off of stocks in complexity mining-and-geological parameters is made. Recommendations about ensuring increase of technical and economic indicators of the coal mines which working off high-gas-bearing layers and spontaneous-combustion coal are made.
The results of the aero- and gas-dynamics processes numerical researches for the sublevel caving mining system with mechanized roof support in conditions of «Kiselevskaya» coal mine are given in the article. It is shown, that reliable and effective panel ventilation is provided with the technological scheme with three entries at the each sublevel. The parameters of the technological scheme are determined.
The analysis of a current state of a problem of emergence of endogenous fires is made at working off of coal layers in mines. Influence of mining-and-geological conditions on efficiency and safety of working off of the layers inclined to selfignition is considered. Need of an integrated approach to a solution of the problem of endogenous fires is shown at working off of stocks in difficult mining-and-geological conditions.
The security issues of the deep mining of Prokopevsk-Kisilevsky deposit the Kuzbass are considered. The analysis of the existing technologies and systems development are executed. The recommendations to improvement of the technical and economic parameters, reducing accidents and injuries of the working off inventories powerful coal steeply inclined seams and steep coal seams were given.
The questions of an assessment of production potential are considered here.The defining role of resource potential is given at an assessment of production capacity of mine. Recommendations for determination of rational capacity of mines are given. The necessity of strategic innovative development of coal-mining enterprises is shown.
Existing techniques of an estimation of degree of complexity of mining-and-geological parameters for the forecast of efficiency of economic investments at development of new coal-fields are analyzed. The scheme of typification of stocks on complexity of mining-and-geological parameters both economic efficiency of working off and the technique of grouping of deposits and their sites are offered.
The complex method of a substantiation of ways maintenan to stability of local development excavations in overworked layers is offered. The mark of expected displacement of breeds contour of section local preparatory developments overworked layers is executed. Recommendations about realization overworked systems of working out in the conditions of mine «Raspadsky-koksovaja» are made. Necessity carrying out of developments of 2nd layer with backlog from a clearing face of 1st layer is proved. The mark of influence of parameters of an applied way maintenan to stability of developments on level of production costs is executed.
The analysis of the modern state and perspectives of development of underground coal mining in Kuznetsky coal basin has been carried out. Problems of underground mining of coal seams have been determined. The factors which significantly effect the efficiency of coal mines have been reviewed. The conclusion on necessity of improvement of mining methods for coal seams in complex geological conditions have been made.
Challenges of efficient underground mining of thick flat coal seams are studied. An effective method to secure stability of site development workings in overworked layers is suggested. A conclusion is made on advisability of stress-relief workings construction in preparation of overworked layers. Parameters of slicing mining system and stress-relief workings are justified. Assessment of useful mineral loss enhancement and production cost reduction is made due to introduction of the proposed method. Possible areas are determined for application of this method.
The pipeline from two hinge the sites located along a face, and two telescopic sites on lines is synthesised. Influence of a design of the hinge on losses of pressure and the central corner divergence of hinge sections on effort of its reduction is analysed. The diagramme of communication of width dredging strips of coal with capacity of a layer is offered at the set level of losses of pressure of water in hinge the pipeline and effort of its reduction.