Filatieva, E. та Sokolenko, V. та Oleynichenko, A. та Filatiev, M. (2020) FEATURES OF METHANE RELEASE IN THE WING OF A MINE FIELD DURING MINING OF GAS-BEARING COAL SEAMS. Resource-saving technologies of raw-material base development in mineral mining and processing. с. 345-360.

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Title in English

FEATURES OF METHANE RELEASE IN THE WING OF A MINE FIELD DURING MINING OF GAS-BEARING COAL SEAMS

English abstract

Nowadays, gas emission has been studied, in most cases, within separate extraction sites and preparatory mine workings. The process of gas emission outside the exploited extraction sites under the influence of displacement activation of the undermined coal and rock stratum have not been studied thoroughly. This is not reflected in the regulatory documents on the issues of predicting gas emission. Methane release from the undermined sources within and outside the extraction sites is determined by the degree of the stope works development both at the exploited site and in the mine field wing under the influence of the minedout space of the stopped longwall faces. Methane release under the influence of rock displacement activation in some cases leads to unpredictable situations at present. They are conditioned by additional influx of an unpredictable gas amount and the lack of information about mine workings, where this gas emission is possible. Monitoring of changes in gas emission in all mine workings and degassing wells has been conducted in the course of mining the extraction sites, from the beginning of their exploitation to the end of the stope work operations, as well as in the mine field wing. In full such observations have been conducted at “Gazeta Izvestia” Mine in the mine field wing when mining a gasbearing anthracite seam. The total observation duration was 94 months. During this period, eleven extraction sites have been mined by panels to the rise. The experimental data obtained made it possible to determine the patterns of changes in gas emission from the undermined coal and rock stratum within the ex-ploited extraction sites and beyond their boundaries in the mine field wing. Gas emission from the coal and rock stratum within the extraction site is directly proportional to the area of minedout space, the total coal output from the extraction panel, the average daily coal output, and the average velocity of the stope face ad-vance. The most convenient and intuitive parameter for determining the total amount of gas released from the undermined stratum within the extraction site and the average level of methane release is the specific gas emission per unit area of the minedout space. Gas emission outside the exploited extraction site from the minedout space of the stopped longwall faces does not occur in case of incomplete earth's surface undermining. When the complete earth's surface undermining is achieved, the ratio of gas emission within the extraction site to methane release from the minedout space of the stopped longwall face directly proportionally depends on its dimensions.

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