DEVELOPMENT METHOD OF THICK STEEP COAL BED Russian patent published in 2011 - IPC E21C41/18 E21D19/00 

FIELD: mining.

SUBSTANCE: method involves preparation of mine section in the bed at top of bed by performing ventilation and transport openings, alternate performance of extraction chambers from transport opening to ventilation opening by anchoring of hanging bolt and roof. Extraction of inter-chamber pillars with diagonal entry ways is performed in two layers so that pillars under goaf are left. As the extraction chamber and extraction of entry way is being performed at the top of bed there performed is monitoring of the state of unworked coal mass and rocks of top of bed. In case of discontinuity of unworked coal there performed is advance attachment of both sides of part of chamber at bed soil and entry way by erection of the anchor support in soil of bed on lateral sides of chamber and entry way at an angle of 20-30 degrees to vertical, and in case of discontinuity of rocks of the bed top the top of chamber and entry way is covered with metal mesh and deep-laid anchors are used.

EFFECT: invention allows increasing efficiency and safety of development.

2 dwg