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Calculation of emission quantities from different gas emission sources is important to predict gas emission quantity on the horizontally layered working face of a steep seam. However, existing gas emission prediction model has many problems, such as complicated calculation links, poor accuracy and non-applicability to the steep seam. In this study, a model applicable to predict gas emission from horizontal mining layer of steep seam was constructed based on the different-source prediction method. This model was applied to the west wing working face in the 45# seam of WuDong Mine in Xinjiang Autonomous Region in China. Prediction results of this model were compared with existing standard data of the different-source prediction method. According to analysis results, existing different-source prediction model is optimized specifically and the proposed model adds predictions of pressure relief gas emission in coal mass below the mining seam and gas emission in top goaf. The calculated gas emission in the working face presents an error of +8.63% with actual gas emission. This error conforms to the practical situation of horizontal layered mining of steep seam and verified the reliability of the proposed model. Conclusions obtained in this study serve as theoretical references to gas emission prediction in horizontal mining layer of steep seam.

Study on Gas Emission Prediction of Steeply Inclined Coal Seam Applied Horizontal Slice Mining