COMPLEX METHOD OF PRELIMINARY DEGASSING OF WORKING COAL BED, WORKED-OUT AREA AND ACCOMPANYING BEDS AND CONTROLLED CAVING OF HEAVY ROOF Russian patent published in 2015 - IPC E21F7/00 

FIELD: mining.

SUBSTANCE: invention relates to mining industry, namely to underground coal extraction. The invention proposes a complex method of preliminary degassing of a working coal bed, a worked-out area and accompanying beds and controlled caving of heavy roof, which involves performance of field development workings - strike entries and cross-entries; then, out of degassing-torpedo in-bed workings there drilled are groups of wells into soil and roof of the bed, and out of the leading in-bed working there drilled are long wells that are directed towards the worked-out area; after that, the leading shooting is performed to create fractures, and smooth roof caving is performed. A set of activities includes location of groups of wells that are common both for degassing and for shooting, and when field development strike entries are being developed, safety stiff and flexible pillars are formed. The wells drilled in the bed roof are of a degassing-torpedo type and they are located in such an order at which formation of fractures is provided by means of the leading shooting for longitudinal caving along the line passing parallel to a longwall. In addition to the leading shooting, lagging shooting is performed, by means of which transverse caving of slabs is performed along the line perpendicular to the longwall. And degassing of the worked-out area before caving in its upper part is performed through half-retained longwalls of the well.

EFFECT: increase of operating safety in a working face in beds that are dangerous as to a gas factor.

6 dwg