Abstract: The protected area of protected seam is often smaller than the protective seam mining area in the process of mining protective seam and the extraction of pressure-relief gas, because of the different seam inclination, the distance of seams, the pressure relief angle and the coal block. The protected seam cannot be continuous mined. The protective seam can not completely protect the protected seam at the same level in remote inclined coal seam. In the research, those methods can be used to solve the above-mentioned problems. First, the application of intensive drilling gas extraction in oversizing area along strike can increase the pressure relief angle from 56°~60° to 90°. Second, two protective seams can be used to protect one protected seam. Third, deepening the protective seam can completely protect the same level of protected seam. In Huainan and Huaibei mines, the protected seam work-face can be equilong and aequilate arranged by using above methods.

Key words: mining protective seam, range extender technology, protected seam, continuous mining