One of the most frequent hazards occurring in Polish hard coal mines are rock bursts, which occur in the most of active mines (70%). Rock bursts are initiated mostly by rock-mass tremors with the seismic energy of 10 4 to 10 9 J. Analysis of roadway support damages resulting from rock bursts during recent twenty years showed that arch supports are not sufficient for rock burst protection of the working. In spite of many years investigations, answer to the question what is the true load of the support during the rock burst was still unknown. Therefore, continuous recording of load with the use of especially constructed device was arranged. In the paper, results of these measurements and their analysis are presented.
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A. Nierobisz (2012) studied this question.