Експериментальні дослідження теплофізичних властивостей гірських порід

Abstract

Purpose. Obtaining data on the thermophysical properties of rock samples of PJSC “CG Pokrovske” under normal conditions in order to increase the versatility of methods for determining the location of the fire source, the location of the fire in the produced space, obtaining an assessment of its condition and monitoring control at various stages of combustion. Research methodology. The article is aimed at studying the characteristics of heat transfer in rocks, in particular at determining the thermophysical properties of rocks, for which experimental studies of thermal conductivity, thermal conductivity and specific heat capacity of rock samples of the Pokrovska mine were carried out with the help of a thermal conductivity analyser TНВ-100 and the influence of humidity on their thermal conductivity was determined properties using the MIT-1 thermal conductivity meter. Results. The obtained data on thermal conductivity, thermal diffusivity and specific heat capacity of siltstone, sandstone and coal samples taken from the “CG Pokrovske” can be used to improve the existing methods of finding the source of the fire and its location in the mined space, as well as to assess and control the state of the fire. The result of such an improvement can be any work in which it is possible to obtain a more universal way of assessing the state of the fire – the fact of an extinguished or burning fire, the temperature in the fire zone, determining the location of the coal ignition centre and, in fact, the fire itself in the mined space. Scientific novelty. It has been established that with an increase in the weight humidity of rock samples, there is a proportional increase in their thermal conductivity, which is explained by the fact that with an increase in humidity, the latter improves thermal contact in places where particles collide, where, first of all, moisture gets into the smallest pores of the material and displaces air from them. Practical significance. In mines, great importance is given to the forecast of temperature indicators when measuring the temperature of the fire rock in the excavation to assess the process of fire development in order to extinguish them as quickly as possible. These indicators are important for the actual assessment of the state of the environment in the centre of its extinguishing, as they are control for determining the cooling of the rocks of the massif and, ultimately, indirectly indicate the fact of a burning or extinguished fire. The thermophysical properties of rock samples obtained as a result of experimental studies make it possible to increase the versatility of fire assessment methods at various stages of its combustion and, in general, to increase the level of endogenous fire safety of coal mines.