Abstract
Gas emission dynamic prediction is a non-contact and continuous outburst prediction method. It is based on the difference of gas emission characteristics whether the working face exists dangerous factors, selecting appropriate indicators to predict outburst danger. The indicators that reflect abnormal gas emission is divided into four types: gas content, desorption characteristics, gas emission fluctuation and gas emission trend change. This paper gives the calculation model of A index that reflect desorption gas content, B index that reflect coal structure and desorption gas characteristics, S index of gas emission standard deviation, Kv index of gas emission variation coefficient. The validity of the real-time prediction using gas emission index for the working face outburst danger is verified by typical cases.
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