Materiały konferencyjne SEP 2023

Szkoła Eksploatacji Podziemnej 2023, Materiały Konferencyjne Justification of conformity of the quick-hardening mixture parameters to the conditions of using protection means of the roadway districts Mykola Stardnychuk IGTM of the NSA of Ukraine, Dnipro Serhii Kurnosov IGTM of the NSA of Ukraine, Dnipro Serhii Makeiev IGTM of the NSA of Ukraine, Dnipro ABSTRACT. The field of application of the results of this work is cast and packed protective-insulating walls, which support roadway districts after the coal seam is mined out. A peculiarity of technologies for constructing these types of protection means of the roadways is the use of quick-hardening mixtures in a liquid state. Therefore, the method for calculating rational parameters of protective-insulating walls was improved depending on the rocks strength and the speed of the longwall face advancing. The method takes into account the dimensionless coefficients of the concrete walls weakening under the influence of their structure, relief irregularities of the rocks pressing the wall, and aggressiveness of mine water, which is used to dilute the mixture. The calculations made it possible to substantiate the conformity of the rate of the concrete hardening in the protection means to the intensity of loads on them in the conditions of the PE "Shakhta Lisova" of the SE "Lvivvugilya". Implementation of the calculation results in the production process made it possible to preserve the belt roadway for its reuse while mining the adjacent panel. KEY WORDS: protection means of roadway districts, reuse of roadways, quick-hardening mixtures, cast and packed protective-insulating walls, intensity of the protection means loading 1. INTRODUCTION Efficiencyof coal-mining enterprises depends, to a large extent, on the state of the mine roadways. To ensure the productive operation of the mine, it is necessary to prevent excessive deformation of the roadways because of the need to preserve their cross-sectional area required for the safe operation of the mine - ventilation, transportation of extracted coal, movement of people, machines and supporting equipment [1]. This is a difficult task.