Exploitation of powered roof support in variable mining and geological conditions

Abstract The powered roof support is one of the essential elements technical equipment longwall. It responsible for safety machines and workers. In addition, its function to move entire wall complex along operational progress combine. Choosing proper per conditions prevailing in an important factor safe effective operation. aim study was assess mining geological Polish hard coal mines terms operation support. author focused mainly on analysing risk rock mass shocks, which significantly impact work describes development tremors recent years. analysis showed intense increase this threat. We present shocks registered Polska Grupa Górnicza S.A. (Polish Mining Group), main producer Europe. results presented paper illustrate scale shocks. current state tremor hazard may be helpful information determining directions optimisation