METHOD FOR UNDERGROUND MINING OF COAL BEDS Russian patent published in 2012 - IPC E21C41/18 

FIELD: mining.

SUBSTANCE: during underground mining of coal beds a coal bed is divided into columns, column development is carried out by arrangement of two parallel development openings, leaving a coal sight pillar between them, serially the columns are treated with long faces for complete roof rock slide in the developed space. Further the coal sight pillar is mined at the same line with the long wall face, one development opening located between the mined and the developed columns is suppressed following the face, pipes are laid coaxially on the foot of the suppressed development opening without leaving gaps between pipes. Besides, prior to suppression of the development opening arranged between the developed and mined columns, in the edge part of the coal bed, arranged at the side of an untouched massif from the suppressed development opening there are blast holes drilled, through which solutions of antipyrogenes are injected into the coal bed. The minimum permissible width of the coal bed edge part zone treated with solutions of antipyrogenes is accepted as equal to the depth of spreading into the edge part of the bed in the area with higher intensity of cracking.

EFFECT: reduced risk of coal self-ignition in edge zones of the bed that are adjacent to the mined space.

1 dwg