Model numeryczny strefy zniszczenia górotworu wokół chodnika przyścianowego

It the paper, trials were presented of mapping, with the help of numerical modelling, of the rockmass destruction zone around longwall entry located in an impact area of moving working front. These trials were undertaken on a basis of results obtained from investigations of fractured zone around the longwall entry with the use of endoscope for bore-holes, in one of hard coal mines of the GZW (Upper-Silesian Coal Basin). While using for calculations program Phase2, which basis is the finite element method, the possibility was demonstrated of problem solution of the fractured zone modelling with two separate methods, for which very similar results were obtained. For first of them, decrease of values of selected mechanical parameters of rocks at the Hoek-Brown criterion with approaching front of longwall was assumed, whereas the another one consists in increasing of stresses around the entry as a result of impact of working front.