METHOD TO DETERMINE METHANE RISK OF DEVELOPING ENTRY Russian patent published in 2014 - IPC E21F5/00 

FIELD: mining.

SUBSTANCE: invention relates to the field of mining and is dedicated to a problem of provision of safety in performance of developing entries by gas factor. The method to determine methane risk of a developing entry consists in determination of geometric parameters of a developing entry and determination of value of absolute gas volume. At the same time they additionally determine filtration and diffusion characteristics of methane motion in a coal bed and a ventilation air jet, they determine average concentration of methane on an outgoing jet from solution of the equation of methane diffusion, they determine methane risk of the developing entry, compare the average concentration of methane at the outlet from the developing entry with the limit permissible concentration and the lower limit of explosiveness of the methane and air mixture. If this concentration is less than the limit permissible concentration, then the situation is not dangerous. If the average concentration of methane exceeds the limit permissible concentration, then the situation is dangerous. If the average concentration of methane exceeds the lower limit of explosiveness of the methane and air mixture, then the situation is extremely dangerous.

EFFECT: increased efficiency of the method to determine methane risk of developing entries, by taking into account effect at methane hazard of developing entries from the mode of operation of a fan of local ventilation, filtration and diffusion parameters of methane transfer with an air jet.