Establishment of Gray Early Warning Model for Gas Abnormal Emission at Extracting Coal Face and Its Application

Based on the gray system theory, the gray early warning model of gas abnormal emission at extracting coal face is established by selecting the more typical four causes of abnormal gas emission at scene. And index weights of each sample and the synthetic weight coefficient of selected sample has been calculated to predict gas emission situation at face according to model measure. The theory prediction and the actual site are consistent, and the model has been verified in gas abnormal emission forecasting.