THE INFLUENCE OF EXTRACTION ON GAS EMISSION FROM THE PRODUCTION SPACE OF STOPPED LAVA

Purpose: to establish the quantitative dependences of gas emissions from the forged coal seam outside the operated areas on the degree of development of treatment works in the mine field. Methodology: the method provides for a comparative analysis of experimental data obtained during the development of several benches in the wing of the minefield. Results: the theoretical model of formation of zones of possible gas evolution from the forged coal seam outside the operated excavation sections at discrete increase of the produced space of the mine field wing by the length of the spent lava is considered. The maximum gas emission both on the excavation site and outside it is associated with the subsidence of the main roof as the development of treatment works and the removal of the treatment face from the split work. Activation of the shift of the counterfeit coal seam outside the excavation section causes an intensive increase in gas evolution, which can significantly exceed its release within the operated excavation section. Such circumstances, to a large extent, affect the safety of mining operations and indicate the need to improve the regulatory framework for the forecast of gas emissions in coal mines. Scientific novelty: statistical processing of experimental data allowed establishing the dependence of the level of gas emissions in mine workings and degassing wells simultaneously from three main factors – coal production and the degree of development of treatment works at the excavation site and within the minefield wing. Practical value: the analysis of long-term experimental results of observations of gas evolution from the forged coal-bearing stratum within the exploited sites and outside them is carried out. With sufficient development of treatment works in the wing of the mine field, the gas emissions outside the operated excavation site can significantly exceed the gas emissions in the site workings and degassing wells.