IDENTIFICATION OF PARAMETERS AND CHARACTERISTICS OF THE VARIABILITY OF GEOMASSIV ON THE LEVEL OF PRODUCTION AND INDUSTRIAL SAFETY OF COAL EXTRACTION AREA OF COAL MINES
The results of the effect study of geological parameters variability of coal-rock mass on the efficacy and safety of underground excavation technology of flat-lying coal beds by complex-mechanized working faces are presented. The signs of the spatial variability of the geometric parameters, strength and deformation properties of rocks, including variations in the stratification depth of coal beds, thickness and slope angle of rock layers, the shape and size of synclinal and anticlinal folds, the amplitude and attitude of disjunction are identified. It is proved that the development of the planning documentation should not take the average values of the geological parameters variability of coal-rock mass, as it leads to under-utilization of expensive equipment resources, adopted in accordance with the limits of variability of geomass, and increases the cost of production of works. When choosing the planning parameters of the excavation areas according to the minimum limits of the parameters of geomass, the limits of the performance of working faces on the gas factor, dynamic collapse of the roof rocks, heaving rocks of the soles arise. It is proposed to use versatile technological schemes of coal extraction areas, adaptive to the parameters of the geomass variability. For this purpose, according to results of expert evaluations of highly skilled specialits of coal mines and statistical analysis of performance and level of industrial safety of complex-mechanized working faces in coal mines of Kuzbass, empirical correlations of risks of deviation of coal production from the project-oriented one and the occurrence of pre-emergency situations with an above acceptable risk are established. To assess the level of expected actual coal production from working face or the entire mine with varying parameters of geomass, the dependence variability, that includes the elemental functions of the impact of particular characteristics of geomass on the production performance is proposed. The main characteristics of the geomass variability are the following: thickness, slope angle, depth of occurrence, gas content, and tendency of coal bed to spontaneous combustion. As additional signs the parameters of disjunction, classes of the roof, sole of bed by stability and controllability are studied. Empirical functional relationship of the production changes and the level of industrial safety on parameters of variability of geomass are established