Abstract:
The coal body along the two sides of gob-side entry presents the characteristics of asymmetric failure and load-carrying capability, and the inclined coal seams aggravate the tendency, so the roadway maintenance is difficult. By using the method of theoretical analysis, the calculation formula of the stress field inside the roadway with inclined coal seam was given, and the influence law of the coal seam dip on the width of the coal pillars is discussed. The reasonable width of coal pillar in inclined seam (25° to 45°) is less than that of the nearly horizontal coal seam (0° to 8°), and with the increasing of dip angle of coal seam, reasonable pillar width of inclined coal seam decreases quickly than that of slowly inclined coal seam (8° to 25°). This paper reveals the control mechanism of the surrounding rock of the inclined coal seam along the empty excavation roadway and develops the control technology, which is applied in practice.