MINE WORKING MAINTENANCE METHOD Russian patent published in 2011 - IPC E21D20/00 

FIELD: mining.

SUBSTANCE: mine working maintenance method mainly for mine openings reinforced with anchor support involves reinforcement of row anchors installed at drilling at the displacement period of roof rocks of the mine working by installing additional anchors into the broken roof rocks of mine working with their fastening in bore pits by means of ampule. In order to slow down the displacement process of rocks in local section of rock delamination of the anchored roof of the operated mine working, reinforcement of row anchors using additional anchors is made by dynamic impact on formation pressure intensity with possibility of roof rock reinforcement. Prior to installation of additional anchors there pre-evaluated are displacement values of roof rocks of mine working and when they exceed standard values, according to safety rules, there determined is the boundary of rock delamination zone of anchored roof of mine working. At that, bore pits for additional anchors are drilled into mine working roof within the designated boundary of the above zone with their location on staggered order in relation to row anchors. After that, first, ampules are delivered to each bore pit; they contain expanding composition the solidification time of which is more than solidification time of ampule with quick-acting fixing agent, which is arranged in the opening of bore pit after the deep part of the bore pit is filled with ampules with expanding composition. At that, at installation into bore pits of additional anchors within the boundary line of rock delamination zone of anchored roof of mine working with destruction of ampules in them owing to spread of expanding composition of ampules around those anchors with its further solidification in deep part of bore pits and compression of reinforced rocks there formed are rock blocks around additional anchors with increased side bracing between them, which contributes to occurrence of adhesive forces of delaminated roof rocks as to their lamination and formation of reinforced zone in roof of mine working in local section of its delamination.

EFFECT: increasing mine working maintenance efficiency.

4 cl, 4 dwg