METHOD FOR PREVENTION OF SUDDEN OUTBURSTS OF COAL AND GAS

摘要

Method for prevention of sudden outbursts of coal and gas is in drilling advanced wells by coal bed in face of mine working, measuring output of chip from same drilling intervals, determination of non-decreasing advance, length and radius of effective effect of those wells. At each interval one determines respective output of chip that is equal to ratio of amount of chip at current interval to measured one at first interval. Non-decreased advance of wells is determined as distance from face of working to interval on which respective output of chip corresponds to 2.0. Length of wells is taken corresponding or larger than doubled not decreased advance. At that in case if at well drilling out of non-decreased advance respective chip output increases over two rate the feeding motion of drill instrument in well is decreased till decrease of respective chip output smaller than two.