ABSTRACT
In the mines of Donbas, in particular in its western region, the central prop stays of the strengthening support are widely used to maintain mine workings in the zone of the stope works influence. They differ in construction: wooden, hydraulic and friction prop stays from the special SCP profile. An important function of the central prop stays is to maintain the cap board of the frame in the area of dismantling its stump near the ‘window’ of the longwall face. The most significant differences are observed in the cap board of the frame, which is quite predictable, since it is in contact with the central prop stay, the resistance mode of which has been changed fundamentally; in addition, the horizontal stresses most informatively describe the process of bending of the cap board under the influence of rock pressure.
