Mountain roof strikes: conditions of occurrence and forms of manifestation

Abstract

The conditions of occurrence of rock bumps of the roof, which on the reasons of occurrence, forms of manifestations, consequences, methods of forecasting and prevention are fundamentally different from the rock bumps, the seat of which is formed in the developed coal seam. The potential energy is accumulated due to the elastic bending of the main roof rocks in accordance with the laws of deformation of inclined plates. At the moment immediately preceding the first subsidence, its value can reach 10 8 J, which is comparable with catastrophic rock shocks and earthquakes. In systems, developments with long and short clearing faces can take place. Reduction of the danger is achieved by increasing the length of the face and unstrengthening the roof rocks. The methods used to prevent formation shocks may be ineffective when there is a danger of rock bumps on the roof.