METHOD FOR OPEN-UNDERGROUND MINING OF THICK FLAT COAL BED Russian patent published in 2013 - IPC E21C41/00 

FIELD: mining.

SUBSTANCE: method includes preliminary preparation of an extraction front, by means of erection of a working site at a ledge of a working board of a cut along a stretching line at the soil level of the mined bed, assembly of extraction works mechanisation facilities on a working site, extraction of coal with these mechanisation facilities aside from the working site by means of performance of parallel extraction chambers of rectangular cross section along a seam falling line with leaving of chamber-to-chamber pillars, release of broken coal in the chamber to the working site and its loading into a transport facility or to a temporary warehouse. The extraction chamber is arranged with a heading and winning machine first at the permissible angle upwards to the bed roof, then - downwards in the bed near the bed roof and is fixed with a support of developing entries, width of the chamber-to-chamber pillar is accepted equal to 3-4-fold width of the extraction chamber, coal of chamber-to-chamber pillar is extracted in diagonal stopes, cut in the layer near the bed roof with a combine from the extraction chamber along both sides while leaving shaft pillars in a staggered order, the length of the stope is accepted as more than the combine length, release of the broken coal in the chamber is carried out with a self-propelled car. Then the extraction chamber is deepened to the bed soil, and coal is extracted from the chamber-to-chamber pillar in the layer near the bed soil under mined stopes in the layer near its roof, ventilation of the chamber during extraction of coal in the chamber-to-chamber pillar is carried out by injection of air along a parallel mine.

EFFECT: higher safety and efficiency of mining of a thick flat coal bed.

2 dwg