№59-04
The rational parameters of backfilling of the worked-out area definition at the selective coal mining
V. Sotskov1, N. Dereviahina1
1Dnipro University of Technology, Dnipro, Ukraine
Coll.res.pap.nat.min.univ. 2019, 59:43-54
https://doi.org/10.33271/crpnmu/59.043
Full text (PDF)
ABSTRACT
Goal. The purpose of the performed computational experiment is to determine the factors influencing the mechanical and geometric parameters of rubble strips erected from suppressed rocks during selective extraction of coal on the state of the geomechanical interface system of the extraction and treatment excavations. The obtained laws provide the optimal choice of technological solutions for the use of partial bookmarks under various mining and geological conditions in a shallow rock massif.
Methodology. A computational experiment was carried out using the finite element method in modeling a three-dimensional computational domain of a geomechanical system. The rock mass is represented by twelve layers of rocks and a coal seam. During the calculation, neighboring rock layers freely move relative to each other. Stresses and strains were calculated in a full-sized block 300 × 160 × 50 m, which includes an untouched massif, a treatment plant and two preparatory workings. The modeling of the mechanical characteristics of rubble strips was carried out using additional analytical calculations. The final conclusions are based on the analysis of changes in the magnitude of deformations of the rock layers of the immediate roof of the mine.
Results. The calculations performed on the state of the geomechanical system of mates between treatment and excavation workings made it possible to determine the characteristic zones of the disturbed rock mass, which determine the development mechanism of the roof collapse of the treatment mine taking into account the influence of the bookmark parameters. The analysis of the stress-strain state of the geomechanical system in the roof of the mine by the selected cross sections made it possible to determine the conditions for the interaction of rock layers as a result of which the roof is lowered to rubble strips.
Scientific novelty. Using the analysis of longitudinal horizontal stresses to determine the optimal parameters for laying the worked-out space allows us to unambiguously determine the type and geometric parameters of the protection scheme for the worked-out working space of a working mine for various strength and geometric parameters of the disturbed rock mass.
Practical significance. The obtained regularities of changes in the stress-strain state of the geomechanical system of the mine working under various conditions of partial laying of the mined-out space made it possible to determine the mechanism for choosing the speed of movement of the face, the type and geometric parameters of the erected rubble strips. This allows you to minimize the cost of internal logistics of the production site, reduce the cost of treatment and improve the safety of miners of the working face. The developed technique allows at the design stage to choose the optimal operating conditions for the working face without additional geological surveys.
Key words: rock massif, treatment mine, stress-strain state, lining section, partial laying, rubble strip.
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