METHOD FOR DEVELOPMENT OF THICK FLAT BEDS OF MINERALS Russian patent published in 2010 - IPC E21C41/16 

FIELD: mining.

SUBSTANCE: method for development of thick flat beds of minerals includes division into layers, arrangement of development openings in upper and lower layers, strengthening of development openings. Layers are developed downstream in longwalls. Development openings of lower layer pass under edge portion of bed, formed in process of upper layer longwalls development. Prior to arrangement of development openings in the lower layer, edge part of bed is weakened over route of development openings arrangement in the lower layer, for instance, by means of wells drilling in bed or creation of slot in bed. Development openings of the lower layer are fixed by anchors, at the same time depth of bed weakening is accepted as larger than width of development opening in the lower layer. Length of anchors is accepted as larger than distance from lower layer openings to bed roof, and depth of bed weakening above route of lower layer development openings arrangement is determined from the expression.

EFFECT: invention makes it possible to reduce labour intensiveness of works and costs for strengthening, to increase speed of development openings arrangement.

2 cl, 2 dwg