TAMPING METHOD OF MARGINAL ROCKS MASSIF OF MINES BRIDGES Russian patent published in 2019 - IPC E21D11/38 E21F17/103 

FIELD: mining.

SUBSTANCE: invention relates to the field of underground mining and can be used to isolate mine workings of coal and ore mines. Method includes drilling of radially directed water-injection wells, tilted over the mine bridge with a predetermined angle of inclination relative to the contour of the mine working, followed by injection into the wells of grout mix. In this case drilling is carried out at an angle determined from the ratio α=22.5⋅h/(H+ΔH) where α – the angle of inclination of injection wells relative to the contour of the mine working, degrees; h is the depth of the zone of intense fracturing of rocks around the mine bridge, m; H is the thickness of mine bridge, m; ΔH – technological shift from the mine bridge to place the injection packer at the mouth of the water-injection well, m; provided that a half of the value of h is equal to the radius of spreading of grout mix along the fractures of rocks.

EFFECT: technical result is to improve the quality of injection hardening and compaction of damaged marginal rock mass around the bridges of mine workings.

1 cl, 1 dwg