Tests on Hydraulic Props Equipped with Yield Valves at Dynamic Load Modelling a Rock Burst

The article presents the results of tests on SHC-40 hydraulic props equipped with two types valve blocks: standard (with spring steel cylinder) and BZG-2FS gas spring). research was conducted using impact mass 4,000 kg extreme dynamic load free fall 20,000 released from different heights h. involved a camera speed image capture up to 1,200 frames/sec, which made it possible register stream liquid at determine opening time. study NHR10 fast acting relief, showed that prop block is more suitable effective in case areas high risk mining tremors rapid stress relief seam. Research methodology developed Central Mining Institute combines digital recording technique pressure registration images, allows acquire accurate analysis phenomena during testing.