MINE WORKING SOIL ANTI-SWELLING METHOD Russian patent published in 2011 - IPC E21D20/00 

FIELD: mining.

SUBSTANCE: at protection against mine working soil swelling there performed and reinforced are mine workings with frame support; and at the same time, thickness of swelling soil layer is determined. After thickness of soil swelling layer is determined, anchors are installed along the outline of mine working arch in the gap between frames of constant support. As the anchors are being fixed, there formed is load-carrying arch of reinforced rocks along the outline of mine working arch so that it can be borne with its bottoms against swelling soil layer on both sides of mine working beyond its limits. As the load-carrying arch of reinforced rocks is being formed along the outline of mine working arch owing to its being supported with its bottoms on swelling soil layer with simultaneous force impact on it on both sides of mine working there formed is support block on each of them. Outline of each support block represents flattened pyramid. Then, inclined anchors are installed into the soil of mine working at its sides in location plane of anchors of load-carrying arch and at an angle to horizontal, which correspond to inclination angle of trapezoid diagonal to the horizontal built for each support block. Length of inclined anchor in each support block is assumed equal to length of diagonal of the built trapezoid. Deep-laid anchors of known design are used as inclined anchors.

EFFECT: increasing maintenance-free operating life of mine workings.

3 dwg