DEVELOPMENT DEPTH AS COMPLICATION FACTOR OF WORKING OFF CONDITIONS OF COAL SEAMS

Purpose: development of a scientific approach to clarify the areas of technologies application for mining roadways protection on the depth of mining operations. Methodology. Analysis and generalization of the results of scientific and technical research on the impact of natural phenomena on the process of coal mining. Graphoanalytical establishment of application and areasand determination of critical depths for protection mining roadways technologies. Results. Was studied and generalized the information on the influence of natural phenomena on the process of coal mining with the transition of mining to great depths. The necessity of determining the critical depths, exceeding which complicate the conditions of coal seams development due to the negative manifestations of natural phenomena, which requires changes in the technology of mining. Critical depths for different conditions, phenomena and technologies are different. For gas-saturated seams, they are determined by the methane-bearing capacity of seams, production intensity and ventilation conditions of underground roadways, for seams prone to gas-dynamic phenomena – they are determined by the stress-strain state (SSS) and strength of surrounding rocks. The critical depth in the application of protection roadways technologies also depends on the SSS of rocks and their strength. Therefore, a scientific approach has been developed to clarify the areas of application of technologies for the protection of mining roadways on the depth of mining. The critical depths are determined by the strength conditions of the rocks according to the relevant criteria. It based on the Ncr/Rc criterion, graphoanalytical method for determining the areas of application and determining the critical depths for different technologies of protection mining roadways was proposed. Scientific novelty: was developed a scientific approach to clarify the areas of application of protection mining roadways technologies on the depth of mining. Practical significance: the proposed approach to clarify the areas of application for the protection of mining roadways technologies at different depths simplifies the search for effective engineering solutions during planning mining operations.