METHOD TO SUPPORT MINES Russian patent published in 2011 - IPC E21D20/00 

FIELD: mining.

SUBSTANCE: method to support mines, preferably mines with preservation for subsequent use when working coal beds in long columns includes reinforcement of short anchors of the first phase installed when working in the mine roof by adding longer anchors of the second phase with their arrangement in staggered order in respect of the short anchors of the first phase and in the plane of the cross section of the mine. Additional long anchors of the second phase are hollow anchors with helical winding at their external surfaces. Besides, installation of the second phase anchors is carried out along the mine in separate sections, length of each one is accepted as corresponding to the length of the end part of the abutment pressure in the mining face equal to 0.3 l, where l is length of the mining face abutment pressure zone. At the same time conditions of mine support are ensured in the following order, first at the next section of the mine the specified anchors are installed simultaneously with mining face sweep to advance this mining face by 1.3 of the length of its abutment pressure zone, in front of which there is a section of the mine with the length equal to 0.3 l, with previously installed anchors of the second phase in front of the abutment pressure zone. And then, as the mining face is swept, as soon as the mine section with previously installed anchors of the second phase, located in front of the abutment pressure zone, gradually gets under the effect of the end part of the abutment pressure zone, the roof rocks flaked at this section are strengthened in stages by injection of a fixer solution into them via hollow anchors of the second phase, thus developing a strengthening zone in the mine roof, which helps to slow down the process of flaky cracks formation in the thickness of the mine roof rocks thickness. At the same time as works are completed to strengthen the roof rocks at the specified section of the mine being under effect of the end part of the abutment pressure zone, anchors of the second phase are again installed at the next section of the mine provided that the specified advancement of the mining face is observed, and flaked rocks of the roof are strengthened at the previous next section of the mine with installed anchors of the second phase after it gets under the effect of the end part of the mining face abutment pressure zone. Further as the mining face is swept, operations are continued as per the prescribed order to install anchors of the second phase in front of the zone of abutment pressure and strengthening of the flaked rocks of the mine roof in the period of effect of the end part of the abutment pressure zone at the specified sections of the mine corresponding to these operations.

EFFECT: preservation of the mine in the operational condition for repeated use behind the mining face.

2 cl, 5 dwg