Khokhlov B. Justification of technical wells in mining coal seams of the Donets Coal Basin

Subject of research is movement of undermined rock mass enclosing technical wells. Work objective is finding parameters for effective protection of technical wells based on the determined regularities of rock mass movement when mining coal seams. Integrated research method was used including literature data analysis, research and analysis of experimental investigations of rock mass and surface movement, archival data classification and analysis, integration of findings and determining quantitative and qualitative regularities by mathematical statistics methods. Factors that effect conditions of technical wells are found and parameters of the dependence which determines safe conditions of their undermining are determined. Critical values of dips and relative vertical deformations of undermined rock mass at which technical wells loose their functional performance are defined. For the first time the type and parameters of dependence that takes into account the joint impact of coal-face work factor and diameter of the well itself on the degree of disruption of vertical mine entry are determined. Dependence of the near-surface zone on the ratio of surface undermining is determined for the first time. A new dependence of maximal dips within rock mass on the total impact of a complex of factors is found. Procedure related to the efficient coal-face work in the zones of impact on technical wells is developed. Findings of research are included as constituent in a number of the guidelines for protection and undermining of technical wells and vertical shafts at the mines of the Donets Coal Basin. Field of application is coal-mining industry.