Longwall Top Coal Caving in the Centrum Mine in the Czech Republic

Control for the large section roadway under small abandoned mines in the same coal seam by secondary support

“…3 Obviously, the thick coal seam is particularly important for coal industry in China. Because of high-intensity mining and rigorous requirements of ventilation and transportation, the section area of main roadways is generally over 15 m. 4,5 When the coal seam has relatively high strength, the driving roadway in ultrathick coal seam could not only increase coal production, but also dramatically improve the excavating rate. 6 Therefore, this roadway driving method is widely used under permitting conditions.…”