Analysis of Application Efficiency of Single and Double Row Mechanised Fixtures in the Conditions of Synchronization of Mining Works and Flooding of Mines

Abstract

Purpose. Determination of a rational option for using a type of mechanized fastening in the conditions of simultaneous flooding of mines and mining operations, taking into account the manifestations of hydrostatic pressure formed in the main roof of the coal seam. Method. The research used the method of numerical modelling and analysis of the displacement of the sole and roof of the coal seam and the prediction of the step-by-step progress of the cleaning pit in the layered transversely isotropic massif of rocks using the Solid Works 2019 software package. Results. Obtained statistical parameters of the use of mechanized fastening in the hydrogeotechnical conditions of the mines of Western Donbas based on the collected actual data of the mining enterprises of PJSC «DTEK Pavlogradvugillia». The reasonable feasibility of using a supporting and fencing four-pillar, two-row mechanized fastening of the KD-80 type by comparing the results of modelling its operation with a two-pillar single-row fastening of the Ostroj-70/125 type in conditions of a layered massif with manifestations of hydrostatic pressure. Scientific novelty. For the first time, a geotechnical forecast was performed on the basis of numerical comparative modelling of the operation of single- and double-row mechanized fasteners in the conditions of simultaneous flooding of the mine and mining operations, taking into account the manifestations of hydrostatic pressure, which is formed in the main roof of the coal seams of the mines of Western Donbas. When using two-pillar single-row fastening, the value of convergence can increase by more than 33%, in comparison with four-pillar two-row mechanized fastening of the support-fencing type. Practical significance. The research results make it possible to determine a rational option for using the type of mechanized fastenings for the complicated hydrotechnical conditions of coal mining from ultra-thin coal seams of the mines of Western Donbas, as well as to develop recommendations for technological improvement of mining operations, to minimize accidents associated with the subsidence of sections of mechanized fastening «on hard base», which significantly increases the efficiency of coal mining.