Protection of the longwall's excavation located in very complicated geological and mining conditions, is very important element of the safe and economical underground coal exploitation. Especially it concerns the coal mining in poland. As the exploitation result of the deeply located coal seams, the powered longwall units are loaded; in static way- be support of the roof exposed during coal face cuttingk, in dynamic way - by rocks replacement during their settlement at the goafs.
展开▼