CONTROL METHOD OF POORLY CAVING ROOF AT ENTRY OF MECHANISED COMPLEX TO REMOVAL CHAMBER Russian patent published in 2013 - IPC E21D23/00 E21C41/18 

FIELD: mining.

SUBSTANCE: before the face enters the formation roof, wells are drilled towards each other on the side of extraction gates, in pairs as to formation and parallel to the support line at the distance from the well projection to the bottom of formation to the nearest point of removal chamber, which is equal to 0.7-0.8 of periodic step of convergence of the main roof; they are charged and blasted after the support line, by means of which a support is created on the side of worked-out space for a hanging plate of the main roof throughout the length of face by using the roof rocks fallen during blasting operations. Coal pillar arranged between mechanised support and removal chamber is provided with artificial flexibility and extracted under protection of the plate of the main roof, which is borne against the rocks fallen during the well blasting operations. The specified artificial flexibility is provided for the pillar by drilling from removal chamber of wells at the formation roof towards the face.

EFFECT: considerable improvement of safe operations at entry of the complex into removal chamber in wide range of conditions of coal beds occurrence.

2 cl, 3 dwg