METHOD FOR UNDERGROUND FLAT-LAYING MINERAL SEAM MINING Russian patent published in 2007 - IPC E21C41/16 

FIELD: mining, particularly methods of underground mining.

SUBSTANCE: method involves cutting mineral seam in chambers along with rock strips erection in chambers and mineral rib pillars leaving; laying U-shaped boxes on seam ground so that the boxes are transversal to chamber ground and are behind chamber face line, wherein the U-shaped boxes have surface opened towards seam roof; filling the boxes with gob from complex seam interlayers for height determined from mathematical expression; covering U-shaped box filled with gob with next U-shaped one having greater dimensions and surface opened towards seam ground to create closed outline of the first layer; creating closed outline of the second layer on the first layer outline by arranging U-shaped boxes transversely to that of the first layer, wherein pneumocylinders are inserted in U-shaped boxes of second layers and have surfaces opened towards seam roof; closing pneumocylinders with U-shaped boxes having greater dimensions and surfaces opened towards ground; filling pneumicylinders with compressed air and expanding boxes of the first and the second layers between seam roof and ground; unloading and removing pneumocylinders after bringing the second layer pneumocylinders together under the action of rock pressure; laying wooden washers in place of pneumocylinders location.

EFFECT: increased performance and decreased mineral losses due to increased chamber width.

6 dwg