High energy impact on powered roof supports
SIKORA  W.

S u m m a r y
Tasks of the roof support in longwall faces and types of dynamic phenomena in the mining industry as well as factors influencing bumps were presented. A use of powered roof support has the significant impact on bumps reduction in face as it improves supporting of the roof, reduces the bump hazard in the face and moving the hazard from longwall face to the near-longwall roadways. The roof support can also reduce bump effects due to a special design.