DETERMINATION OF THE RATIONAL BACKFILLING PARAMETERS DURING SELECTIVE EXTRACTION TECHNOLOGY OF THIN COAL SEAMS

Abstract

Purpose. Substantiation of the backfill massif parameters in fully mechanized selective mining thin coal seams, taking into account the influence of technological and mining-and-geological conditions. Methods. The integrated approach which includes the analysis and generalization of scientific developments in the field under study, analytical and numerical methods for determining technological parameters is used in the work. Findings. The results of studies of the influence of complex technological and mining-and-geological conditions on filling massif parameters while selective mining are given in the paper. Using the example of numerical calculation methods for the selected initial characteristics of the mined coal seam the following trends are revealed: the shrinkage value of the filling material Eв from the ultimate rock strength σст and the relative density γв; the length of the filling mined-out space lз and the size of the undercut rocks mпр, the filling density γв and the technological gap Δhтех; the initial height of the filling massif formation hЗ and the effective seam thickness mеф from the support resistance Pк and the rock strength of the filling material σст. Originality consists in the determination of the change regularities in the roof subsidence and deformation of the filling massif from the technological parameters of the site and the face support while effective coal seam development by technological scheme of selective coal extraction. Practical implication. The research results can be used in the design of technological schemes for coal mining with backfilling and leaving waste rocks in the worked-out area. Key words: backfilling of worked-out space, selective technology, parameters, regularities.