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In Poland, in the Upper Silesian Coal Basin, underground exploitation of coal seams has been conducted for numerous years, causing a gradual depletion of deposits from previously mined levels. Hence, the depth of mining works carried out each year increases by 5 ? 8 m on average. Currently, already several mines operate at the level of 1,000 m and greater. Designing ground support of excavation and maintaining its functionality at such significant depths has, therefore, become a very important issue from a practic...