METHOD FOR DEVELOPING AREA OF FLAT AND SLOPE SEAM LIABLE TO ROCK-BUMPS Russian patent published in 2012 - IPC E21C41/16 

FIELD: mining.

SUBSTANCE: extracted core of expendable wells helps to define the outline of bed pinching-out at the area, inside the outline the limits of its standard power are registered and on the base of their average position of seam strike the contoured workings are passed. First cuts are located perpendicular to contoured workings upslope or down-dip and till the outline of bed pinching-out and separate the area to paired blocks. Beginning from the end of each paired block and by moving the front line of extraction by reverse movement there are adjacent extraction workings going from the first cuts to both sides with axes shift and parallel to contoured workings; adjacent extraction workings help to extract the bed selectively and are performed with ground and roof breaking, between the paired blocks there remained are solid blocks with width not more than 10% of abutment pressure zone. Each paired block has formed groups of under-goaf and one support solid block. During seam extraction there drilled are prognostic holes and control the degree of rock-bump hazard is performed, if it is revealed the support solid blocks are unloaded.

EFFECT: increase of safety of developing the area of flat and slope seam liable to rock-bumps and reduction of mineral product losses due to involvement of bed pinching-out areas into actual mining.

3 cl, 3 dwg