METHOD OF EXCAVATION IN OUTBURST-PRONE SEAM Russian patent published in 2014 - IPC E21F7/00 

FIELD: mining.

SUBSTANCE: invention relates to the field of mining, preferably, to coal industry, and may be used for safe excavation in an outburst-prone seam by gas dynamic and gas factors. The method includes excavation of a mine, its ventilation, control of methane control in a bottomhole and in an outgoing air jet, arrangement of degassing wells with non-reducible outstripping in a coal massif at the sides of the main and a discharge-drainage well along its axis. At the same time the wells are arranged for the length of the weekly interval of the excavation. Prior to another excavation interval they arrange a portable device, which is used in case of a gas dynamic phenomenon to urgently cover the cross section of the mine, and with a limited flow rate they discharge a gaseous mix from the bottomhole into an outgoing jet. Besides, during discharge of the gaseous mix they support methane concentration in the outgoing jet of the mine as not more than 0.5% by the volume by means of supply of additional quantity of fresh air into the mine. The discharge-drainage well at another interval of excavation is carried out remotely after connection of barrier wells to a degassing pipeline. In case of gas dynamic phenomenon and achievement of more than 1% of methane at the head of another excavation interval they automatically put in service an additional fan of local ventilation, fresh air is supplied into a jet outgoing from the mine, the gaseous mix is dissolved to normative content of gases in the mine atmosphere.

EFFECT: increase of safety of excavation works in a outburst-prone seam in a mine, exclusion of its gassing in case of a gas dynamic phenomenon, and distribution of a gaseous cloud in a network of mines.

3 cl