The paper considers three basic schemes of roof failure above the face bottom of long-wall during mining operations covering the whole diversity of mechanisms of support-roof interaction. The model of interaction between the powered support and heavy roof is given as well as the calculated scheme for the determination of necessary rated resistance of roof.
It was established the reciprocal interaction of longwall advance velocity, mining depth and main roof thickness per a pace of its subsidence; the proper graphs have been constructed.
In caving of main roof rocks immediately overlaying the seam, a great amount of energy from elastic compression of rocks is released, in consequence of that the dynamic loading on the powered support takes place. Consideration is given to the influence of the support power parameters on the loading dynamics.
