FEATURES OF DEFORMATION OF MINING PRODUCTS IN THE AREA OF INFLUENCE OF BROKEN WORKING
Authors: Kostenko Oleksii , Yuliia Simonova , Gogo Volodymyr 
Published: June 2024

Purpose. Study of the features of deformation of preparatory products under the influence of broken working in the conditions of shallow layers of deep mines of Donbas.

Research methods. In order to achieve the goal, the deformations of roll-back lines at different stages of their operation were experimentally investigated, the stability of rollback stretches on steep formations with different methods of their protection is evaluated. The influence of geomechanical processes in such a coal-bearing massif being developed and the deformation properties of protective structures of preparatory workings on their stability along the length of the excavation section in a deep coal mine with steep strata occurrence is revealed. The method of mass measurements of convergence on long sections of the stretch was used.

Results. The regularities of the impact of the state of the coal-bearing massif being developed on the stability of the workings along the length of the excavation section have been clarified. The relationship between the magnitude of vertical displacements of the production contour outside the zone of influence of broken working and in the zones of dynamic manifestations of the support pressure of the coal face has been established. This resulted in a substantiation of the method of ensuring the stability of the product under the influence of broken working. It allows, long before the approach of the coal face, to predict deformations of the contour on individual parts of the production, to quickly identify areas that require the use of additional measures to preserve the stability of the production. For the first time, the uneven nature of displacements along the length of the workings located in the virgin massif was experimentally established, which is explained by the unevenness of the properties of the mountain massif and the cyclic nature of the tunnelling processes. Based on the results of this, a simple and inexpensive method of forecasting displacements of the product after the passage of the lava is proposed. Analysing the predicted deformations of the contour on individual parts of the product, it is possible to quickly determine the areas that require the application of additional measures to preserve the stability of the product. This makes it possible to ensure a satisfactory operational condition of the tracks.

Scientific novelty. The understanding of the mechanism of deformation of treatment products in a more detailed spatio-temporal aspect has been improved. The dependence of the convergence in the stretch under the influence of broken working on the state in the pristine massif was established.

Practical meaning. Using the data on the state of the unspoiled massif of the product, it became possible to predict its deformations during the period of impact of broken working, this makes it possible to strengthen the fastening in advance and improve the operational condition of the stretch.

Key words: preparatory working, mining pressure, broken working, stress-deformed state of the rocks, deep mines, displacement, forecast.