Possibilities and results of suppression of the kinetic energy impulse, transferred to the lemniscate support unit by surrounding rock before the relief valve start to operate
PTAK J., LOSIAK S.

S u m m a r y
The paper concerns the possibility of suppression of the kinetic energy, transferred by the lemniscate support unit by surrounding rocks, at the first stage of legs operation. It gives a condition of the kinetic energy suppression and equations for the support system operation. It results, from the equations, what kind of design and roadway parameters influence the support system operation which can suppress a kinetic energy transferred to the unit as an impulse. Given relationships were illustrated by exemplary calculations which represent the effects of the partial suppression of energy impulse.