ABSTRACT
The Wujek hard coal mine ranks among the most afflicted with rockbursts mines in the Upper Silesian Coal Basin. Annually, several thousand seismic events of the energy E> 103 J occur there, of which the strongest ones reach the energy level 108 J. The destressing blasts carried out in both coal seams and roof rocks are designed to transform the rock mass structure and to liberate the accumulated energy by safe and controllable means. As a result the rock mass will be destressed. To assess the effectiveness of destressing the informative, geophysical parameters have been introduced, the distribution of which allows rational control of preventive measures. This possibility has been confirmed by the examples from the Wujek coal mine and the analysis of existing experiments allows to state some general rules to carry out destressing blasts effectively.
