ОБҐРУНТУВАННЯ СПОСОБУ ПРОГНОЗУ ВИВАЛОУТВОРЕННЯ ПОРІД ПОКРІВЛІ НАД ОЧИСНИМ ВИБОЄМ

Abstract

Purpose. Justification of parameters and development of the method of forecasting the formation of roof rocks over the coal face. Methodology. Numerical modeling of the volumetric stress-strain state (finite element method), the method of continuous media, the method of contact interaction of surfaces, analytical studies of the process of rock cave-in formation of the roof rocks. Results. The article presents the methodology and results of numerical modelling of the volumetric stress-strain state of a layered rock massif, with boundary conditions of contact interaction between rock layers and with the load of gravitational forces. It has been established that the process of formation of a bulge in the zone of support pressure begins with the formation of intersecting systems of cracks, the direction of which depends on the angle of inclination of the plane of destruction. For the prediction of rock cave-in formation, the criterion of crack resistance of rocks under mixed loading of a through crack has been substantiated. The method has been developed for determining the local zones of formation of cave-in, which allows determining the location of the fallout in the excavated longwall field and its parameters. Scientific novelty. The method of predicting the parameters of the formation of rock cave-in has been presented for the first time, taking into account the criterion of crack resistance of rocks under mixed loading of a through crack. Practical significance. Practical significance lies in the method of predicting the processes of cave-in rock formation in the roof rocks during the working of coal seams and determining their parameters.