Mathematical modeling of methane migration into the mine workings during the face downtime

[摘要] For the estimation of safe distances during explosions of mixtures of coal dust, methane, and air in the process of emergency rescue operations in coal mines, it is necessary to determine the gas volumes in the mine workings. Errors in determining such volumes often lead to tragic consequences. The calculation schemes are suggested that allow the methane generation rate into the mine air to be determined on the basis of physical regularities (mine and gas pressures, gas permeability dynamics, depth of the gas drainage zone, etc.), underlying the processes of gas migration from coal and rocks into the mine workings. The following methane emission sources are considered at the site: the surface of the stopped face; walls of development opening; the gob (potential volume of the gas reservoir in the caving area). Test calculations of methane generation have been performed based on the mining, geological and technological data of one of the mines in Baydaevsky geological and economic region. In general, the results obtained are consistent with the data of long-term empirical observations. The directions of further research aimed at improving the synthesized methodology are presented.

[发布机构] National Mine Rescue Center, 5 Gornospasatelnaya Street, Novokuznetsk; 654028, Russia^1;Siberian State Industrial University, 42 Kirova Street, Novokuznetsk; 654007, Russia^2

[效力级别] 地球科学

[关键词] Calculation scheme;Economic regions;Emergency rescue;Generation rate;Methane emissions;Mine workings;Safe distance;Technological data