EXPERIMENTAL STUDIES OF AIR MOVEMENT PARAMETERS IN GOAF AREAS

Abstract

Purpose. Based on in-situ mine experimental observations, to reveal the regularities of air movement in the compacting rocks of the extraction section goaf.

Research Method. In-situ instrumental measurements of air distribution in mine workings located within the goaf area near the longwall face.

Results. The mining-geological and mining-technical conditions for maintaining ventilation workings in the deep mines of the Donbas are described. The indicators of air surveys in these mine workings are presented. An analysis of air leakages into the goaf of the extraction section is performed.

Scientific novelty. Based on in-situ mine observations, it has been confirmed that the collapsed roof rocks are an impermeable environment for air moving due to the general mine pressure differential (depression). This applies equally to both compacted and non-compacted areas of the undermined massif at the level of the seam floor. From this, it can be concluded that the emergence of coal self-heating focal points is impossible there due to the lack of air exchange. The process of undermined massif subsidence over artificial structures leads to the formation of cavities ‑ air collectors. Therefore, there is a threat of self-heating of the coal left near such artificial structures.

Practical Significance. The presented research results supplement modern concepts of air flow movement in the goaf of an extraction section and are of significant importance for ensuring the reliability and safety of mining operations at great depths, as well as for the prevention of endogenous fires.